make a ticket to rs about your account and give them as much info as you can
after 1-3 days you'll get pmed by a jagex mod in message centre , he'll give you questions to answer , reply back to him with answers , 1-3 days later you'll get a message that if its locked (success) , if so , you may now go to ''Recover account'' and put the email login of the account. Put all info you know then you'll get a email that you choosen , If it was accepted then you're getting your account back if not then retry or give up.
EDIT: Your name is that because someone stole your name OR your account got deleted because you botted.