Poor service

Poor service from WIlliams Hunt Fourways. I took my car in for service and had also requested that they fix my headlights. I was informed that I would need to pay a deposit for the headlights to be ordered as it was a special car part which is never in stock. I paid the deposit and sent proof of payment and called them to make them aware of the payment. Please note I was told that I would be updated when the part had arrived but that never happened. I would continuously call them to get a follow up at my own accord. I called them after 2 weeks to check if the part had arrived and eventually I was told it had. Bought my car in for the part to be installed but on the same day, I was told it is the wrong part. I would have to spend an additional 10k to get the part in which I refused as that was not within my budget. I was told I would get a refund once I have sent the particulars and was told it would take a week and now it is over a month and I still have not received my refund. I also discovered that my car was giving me a warning light to check my brakes, took my car back in for them to check and it was reported that they just need to change the globe. The warning persisted even after the globe was installed and I took it back to them and I was informed that they would need to maybe change the socket and I would be contacted when the work needs to be done. Its been 2 weeks no contact has been made. I have not received my refund over a month plus now.