Haider gearbor

I'm me AM Malatjie Id no ***. Last year I took my car to haider gearbox in Mayfair Gauteng which they promised me the car will be fixed after a Payment of deposit which did,now i had been told many stories. In February they called that the car is fine the,i went to collect it, we then test drive it the gearbox got jammed and they told me they need more two days to fixed the problem,two days had since past by i have been in contact with them, the answer is always this it will be fine but nothing happened now I became frustrated i have finished paying them R 30000.but the is still with them,but I was told they are gearbox expect.please assist me.