If you're 100% sure that you're trying to login with the right username. Try to use the latest version, or switch to the steam version if you're currently on standalone. Might work.
There's a chance you can't login because of the - in your name, so something you could also try is manually editing the tb_login.dat file in your toribash folder.
You can just open it with notepad, make sure the content of the file says:
user Mahulk17-0
pass password