Text to be displayed in different lines

begin


grays_email_handler.send_email
                        (
                        ' Your Customer Statement',
                        'dh@hotmail.com',
                        'Customer No : '||'4721'||chr(13)||chr(10)
                        ||'Customer Name : '||'TUYAU ' ||chr(13)||chr(10)
                        || 'Email :' ||'dh@hotmail.com' ,
                        'From ',
                        'Statement',
                        NULL
                        );


end;

I am not getting Customer name in another line.  It is in one line.Could anyone help