My son(student) drives a VW Jetta which began to backfire and the engine is choppy.

He took the car to a VW workshop and they replaced the carb telling him that was the problem. After a R5000 repair bill the symptoms are still there. Now they say the TCI unit is faulty and will repair for R6000.
They also told him the old carb had a leak and had to be replaced.

To me this seems a bit fishy as I got a estimate for a TCI unit for around R500. My advice to him was to demand they put the old carb back and give him his money back.

What is his chances to succeed under the new consumer act?