Robert's Paint - Collision & Mechanical Repair

Last October I had a car accident on the 35, and robert's paint-collision took my car to repair the trunk. They took a whole month to fix my car and told me more than three times that my car was done and once I was going to pick it up, they said that it wasn't done and come back the next day.
On June, I noticed that the paint of my car's trunk started to come out. I called them, they said to go to them so that they can check it. Once I arrived to them, they checked it and said they were gonna give me a rental car, fix it for free and that they were going to take maximum four days to fix it. On the same day, they called me to say that the car had a bump and that they were not gonna fix it for free anymore, we had a fight on the phone and told me that I needed to give the rental car back that same day or I was gonna pay the extra days. Later, I went to give the rental car back, and they made me pay 87.43 for the extra two days. In conclusion, my car DOESN'T have any bump.