Dodgey and no accountability

Had a bumper repair. Was told it would take 10 days max they had my car for a month. Some shipping issues of bumpers I was told. When i took my car in I informed the staff that my tyre might have a slow puncture but just keep an eye out. Other than that nothing wrong. The day I got my car things were great the bumper looked great . I drove home (convertible bmw ) my top was down and when I got home and tried to close my windows and convertible top it never responded. My car was stuck open and nothing worked. Ofcourse something was wrong, I took it back and the service advisor straight out denied touching anything on the car convertible or windows. Then he went on telling me everyone knew that this windows was an issue....er no! ...asked for the checklist and this too looked super dodgey. First it was ticked fine...then suddenly it's not fine and I wasnt made aware of it? Also I rolled down the windows before I left the place originally just fine...so how come the reports ever showed the windows never worked? Absa I direct recommended I take my car here...I'm going to take this up with them I cannot believe with such an issue was just okay for the service advisor. Second to that I finally told him let me show you what is the problem and magically the windows and convertible worked. So how could he say it didnt work before? I to this day never took the risk dropping the top again and want them to get an auto electrician to check this out. I mean how do you take a car in for repairs and another part breaks?