I had a hearing with a city attorney officer and so hired a private defense attorney. He told me me his rate, but said the case was simple and shouldn't take him more than 10 hours, and told me "I can make this go away for $X." He did not expressly promise not to charge more. This was all a phonecall.
I paid $X in full before he began working on the case. I paid with a check and wrote "retainer" in the memo. Never any written agreement.
So my hearing came, my attorney went with me and told my side, and the hearing officer said the case against me is closed. My attorney said I would receive a letter from the city attorney, but that hasn't arrived yet. What has arrived is a bill from my attorney asking for another $1000 for an extra 2 hours of work.
How should I respond to this bill?