diff --git a/bin/doctor_karma.pl b/bin/doctor_karma.pl
index 4d30895..6e4093b 100755
--- a/bin/doctor_karma.pl
+++ b/bin/doctor_karma.pl
@@ -8,6 +8,8 @@ use warnings;
 use Data::Dumper;
 use JSON;
 
+use Mojo::URL;
+
 use DoctorKarma::Config;
 use DoctorKarma::Telegram;
 use DoctorKarma::Logger;
@@ -36,7 +38,7 @@ sub proccess_new_message {
     my $message          = shift;
     my $reply_to_message = $message->{reply_to_message};
 
-    update_user ($message);
+    update_user($message);
     if ( defined $message->{text} ) {
         process_message_with_text($message);
     }
@@ -45,22 +47,23 @@ sub proccess_new_message {
 sub process_message_with_text {
     my $message = shift;
 
-    my $text       = $message->{text};
-    my $username   = $message->{from}{username};
-    my $user_id    = $message->{from}{id};
-    my $first_name = $message->{from}{first_name};
+    my $text             = $message->{text};
+    my $username         = $message->{from}{username};
+    my $user_id          = $message->{from}{id};
+    my $first_name       = $message->{from}{first_name};
     my $reply_to_message = $message->{reply_to_message};
 
     my $log_username = defined $username ? "\@$username" : '';
     $logger->log_info(
         "'$message->{text}' received from $first_name:$log_username:$user_id");
     if ( $text eq '+1' && defined $reply_to_message ) {
-        add_karma_to_replied_message_user ($message);
+        add_karma_to_replied_message_user($message);
     }
 }
 
 sub add_karma_to_replied_message_user {
     my $message = shift;
+    my $chat_id = $message->{chat}{id};
 
     my $reply_to_message  = $message->{reply_to_message};
     my $user_giving_id    = $message->{from}{id};
@@ -73,17 +76,29 @@ sub add_karma_to_replied_message_user {
         $logger->log_info(<<"EOF");
 User @{[$sending_karma_user->first_name]}:@{[$sending_karma_user->username]}:@{[$sending_karma_user->id_user]} tried to give karma to itself, refusing.
 EOF
+        $telegram->send_message(
+            chat_id => $chat_id,
+            text    => 'You cannot give karma to yourself'
+        );
         return;
     }
 
     my $receiving_karma_user =
       $user_dao->recover_id( id => $user_receiving_id );
-    if (!defined $receiving_karma_user) {
-        update_user ($reply_to_message); 
-        $receiving_karma_user = $user_dao->recover_id (id => $user_receiving_id);
+    if ( !defined $receiving_karma_user ) {
+        update_user($reply_to_message);
+        $receiving_karma_user =
+          $user_dao->recover_id( id => $user_receiving_id );
     }
-    $user_dao->add_1_karma(user => $receiving_karma_user);
-
+    $user_dao->add_1_karma( user => $receiving_karma_user );
+    my $id_receptor           = $receiving_karma_user->id_user;
+    my $receptor_telegram_url = Mojo::URL->new('tg://user');
+    $receptor_telegram_url->query( id => $id_receptor );
+    $telegram->send_message(
+        chat_id => $chat_id,
+        text    =>
+"[@{[$receiving_karma_user->first_name]}]($receptor_telegram_url) has now @{[$receiving_karma_user->karma]} of karma\\."
+    );
 }
 
 sub update_user {
@@ -97,13 +112,21 @@ sub update_user {
     my $user     = $user_dao->recover_id( id => $user_id );
     if ( !defined $user ) {
         $user = DoctorKarma::Model::User->new(
-            id_user  => $user_id,
-            (defined $username) ? (username => $username) : (),
-            karma    => 0
+            id_user => $user_id,
+            ( defined $username ) ? ( username => $username ) : (),
+            karma => 0
         );
-        $user_dao->store(user => $user);
+        $user_dao->store( user => $user );
     }
     if ( ( $user->username // '' ) ne ( $username // '' ) ) {
+        if ( defined $username ) {
+            my $user_already_with_username =
+              $user_dao->recover_username( username => $username );
+            $user_dao->update_username(
+                user     => $user_already_with_username,
+                username => undef,
+            ) if defined $user_already_with_username;
+        }
         $user_dao->update_username(
             user     => $user,
             username => $username
diff --git a/lib/DoctorKarma/Model/User.pm b/lib/DoctorKarma/Model/User.pm
index 25bb6e7..713e2db 100644
--- a/lib/DoctorKarma/Model/User.pm
+++ b/lib/DoctorKarma/Model/User.pm
@@ -71,7 +71,7 @@ sub last_karma_given_date {
         my $self = shift;
         my ($new_karma) = $validator->(@_);
         if ( defined $new_karma ) {
-            $self->{new_karma} = $new_karma;
+            $self->{karma} = $new_karma;
         }
         return $self->{karma};
     }
diff --git a/lib/DoctorKarma/Telegram.pm b/lib/DoctorKarma/Telegram.pm
index ff74e36..63420b9 100644
--- a/lib/DoctorKarma/Telegram.pm
+++ b/lib/DoctorKarma/Telegram.pm
@@ -32,7 +32,7 @@ use DoctorKarma::Logger;
 
 sub _logger {
     my $self = shift;
-    if (!defined $self->{logger}) {
+    if ( !defined $self->{logger} ) {
         $self->{logger} = DoctorKarma::Logger->new;
     }
     return $self->{logger};
@@ -62,15 +62,42 @@ sub _user_agent {
         my $ua     = $self->_user_agent;
         my $logger = $self->_logger;
         my $url    = $self->_generate_url( method => $method );
-        my $response = decode_json(
-            $ua->post( $url => {} => json => $body )->result->body );
-        unless ($response->{ok}) {
-           $logger->log_critical($response->{description});
+        my $response =
+          decode_json( $ua->post( $url => {} => json => $body )->result->body );
+
+        unless ( $response->{ok} ) {
+            $logger->log_critical( $response->{description} );
         }
         return $response;
     }
 }
 
+{
+    my $validator = validation_for(
+        params => {
+            chat_id => { type => Int },
+            text    => { type => Str },
+        }
+    );
+
+    sub send_message {
+        my $self    = shift;
+        my %params  = $validator->(@_);
+        my $chat_id = $params{chat_id};
+        my $text    = $params{text};
+
+        my $response = $self->_request(
+            method => q/sendMessage/,
+            body   => {
+                chat_id    => $chat_id,
+                text       => $text,
+                parse_mode => 'MarkdownV2',
+            }
+        );
+        return $response->{result};
+    }
+}
+
 sub get_updates {
     my $self        = shift;
     my $last_update = $self->_last_update;