what's wrong with changing passwords?

I tried logging into my hacked account, and realized my password didn't seem to work, so I tried getting a password reset, but when I went to change the password, nothing would keep it from saying "Invalid Password" when I input the changes in the account info page. I tried pasting the temp password on the "old password" box, leaving it as it was before, but nothing... now, none of my passwords work at all (it doesn't say the account was banned temporarily, which I thought they did for numerous password errors...) so what's going on?