I have no idea what you mean, "he was not willing to give up my case". If you fired him, you fired him. If you let him appear in court for you, you didn't fire him.
If you don't pay your legal fees he can sue you. If he sues you, you can use whatever contracts and/or documentation you have to try to establish that you only owe him the $1,000 and not the greater amount he is claiming. If you believe he committed legal malpractice, consult a malpractice lawyer about your situation.

