Pathetic ECU Computec Service

I sent my car's old ECU for testing and ECU Computec contacted me the next day saying I needed to replace the ECU as it is damaged. About 2 weeks later I then purchased a 2nd hand ECU from them and they did the software transfer from my old ECU to the 2nd hand ECU however, the technicians working on the units swopped ECU covers when I had arranged for them to be collected. After the auto electrician fitted the "Old" ECU the car started but due to the cover swop it was in actual fact the 2nd hand ECU I had purchased. VERY UNPROFESSIONAL. Since the 5th of May they had opted to refund me the R500 labor charge and they still have not got back to me nor was the refund done! I am one unsatisfied customer and will never recommend this place to anyone!