Complaint about Hyundai Bryanston

I have received shocking treatment from Hyundai Bryanston where my car is still sitting after it went in at least two weeks ago for the third time for a heater repair.Heater was not working and producing very luke warm and cold air. They checked it, called me to tell me that my pollen filters were blocked and that's why the heater was not working. I was quoted R1800 which I accepted and paid. But the problem persisted and took it in a third time and was promised it would go to specialist but that didn't happen. They looked at it themselves and finally acknowledged the temperatures were not the same, with 3 degree variance. They were advised by Hyundai head office that this is not normal but the dealer advised me it was acceptable. When I found out that he gave me wrong advise, he then said he can strip the car to investigate further. A week later they call wanting me to pay R10 000 for stripping the car R45 000 for a part to \fix"the heater having never even sent me a quote either by phone"