Auto Mechanic Plus

Asked to check transmission and let me know what's wrong and how much to fix. Three weeks later got call back letting me know the problem and price to fix. With out me giving the ok he fixed transmission and started getting mad because I didn't have 1000.00$ to give him right away. I did not give ok to put parts on vehicle and he told me he had parts to pay for on my vehicle. If I had the money I would had no problem telling him go ahead.but now I have a headache of him being mad at me not being able to pay right now. He knew before calling me the money situation I was in. Found out today, this is what he does, fixes without permission so he's guaranteed to get his money.