Allison Auto Repair & Body shop

I have a Ford mustang GT/CS and I went to this shop to fix the back bumper after an accident I hadthe owner told me is going to cost me 700$and he is going to buy the back bumper from the dealer and paint the back, bumper, the front bumper & side scoopsafter I left the car in his shop and paid him 400$ as a down payment so he can buy the back bumper he called me next day telling me that is going to cost me 900$ instead of 700$ because the paint is special or whatever he was saying and he needs 200$ more if I still want to do itso I had no other choice and I told him okay just make sure you do it perfect, he said don't worryit took him days and then I went there to get the car and it did look alright because I didn't pay much attention for the detailsthere was a plastic part under the back bumper and it was brook so I told him why you didn't get that one, he said it's a different part but if you want you can go buy it and I will put it on for youso next day I wen