Amer Haddadin tells TMZ, he's sick of being jerked around by Octo and her lawyers ... and if they don't settle her gigantic debt by October 9 -- dude says he's going to hold a news conference to tell everyone about how terrible of a resident she has been.

Of course, Nadya has nothing to worry about if she meets Amer's deadline -- but as we previously reported, that's one big if ... because girl still owes over $450,000.