My car starts but wont rev up or even idle

Hi, I recently bought a new car, toyota camry 2006 model v4 engine option, and under two months I clocked almost 200 miles without any issues, then went to the auto shop to have few little things changed, car remote, ac control knob, and the dashboard screen because I felt the mileage wasnt bright enough on the dash and sometimes it flickers, after all this was changed, took it to a car painter for a new paint, the following morning I discovered that my car was starting perfectly but then it wasn't accelerating nor moving, pressing the throttle down flat was having no effect, then towed the car back to the automotive workshop, after running a diagnosis, they said it was a problem with the PCM that probably some wrong wiring have affected it. A couple of other PCM were brought it and none was working, Then the workshop decided to check and trace the whole wiring system of the vehicle, some faults were corrected and wires replaced as they said, afterwards, the problem didn't go away and yet another PCM I had to go get by myself still didn't work. All this has been under a duration of about 8weeks, Contemplating on taking my car away from there but then I don't know the next thing to do or have an idea what is going on.