Worst service received from westgate car service city ****mers

I am very disappointed with the service received yesterday from car service city in westgate. I took my car in for service in May, and shortly after that I learned that my air-conditioning no longer works, and my car is suddenly overheating, I took it back and explained the issue and the gentleman said I should bring it in to check it out, fine I took it in the made me sign a R0 invoice, they called during the day to inform me that they diagnosed it and the water pump is faulty which requires 8k to repair, I explained I don't have that amount of money they must leave it as is, when I collect the car I was hit with R650 bill or I don't receive my keys, I am still within their 6 months warranty , I was ****med ! I will never ever take my car there again . I paid R650 for nothing