Appalling Workmanship

I booked my car at this repair centre on the 6th Jan for repair & collected my car on the 22nd of Jan. Few days after the paint started pilling on the rear right door due to the work done on the car. I have been trying to get them to refix my car with no luck, keeps giving me run around, they struggled to offer me a courtesy car for almost two months. I'm are extremely disappointed about the manner in which this matter have been dealt with. As a BMW repair centre I expected them to deliver good quality. Instead, the work that was done in the car was appalling which barely withstood their quality control checks. It's been almost two months now but still there are failing to resolve this issue and fix my car. I have been patient and given them enough time. Firstly this is their faulty, they have failed to repaired my car properly, just pure poor workmanship.As a customer honestly I don't feel valued, this matter has been dragging for so long and I'm afraid I have lost all my patience with them. Should have been another customer this issue was gonna be resolved long time ago.I reported this to BMW ZA (Case #- 8100870188), still nothing, my car still not fixed. I lost trust in them.