Very unhappy customer

I bought a car in April at We buy Cars Germiston branch. I lodged a concerned regarding the car within 30 days. It is showing a Drivetrain sign and it was like that when I purchased it. Which I was told it's nothing till I took the car to BMW who advised that the car must be checked as something is wrong and it must be checked. Took the car to Bosch in Middleburg who did Diagnostics and advised that they can't give a quote, the car must go bmw. We ended up agreeing to take the car back to them so that they can fix it on the 17th may and I must say the customer service I am receiving is very very poor. There is no feedback, the agent's are rude and unfriendly. You call their customer service and they just cut the call. Today I called 4 times. The 3 times I spoke to the agent's, they told me Karen, the agent who is handling my concern is not at work, and the 4th agent said she is there.😡😡. This is ridiculous I must say. There is no willingness to assist their mistakes. Because wen I bought the car, I was assured nothing is wrong with the, only to find out, it has a major problem. Can someone take accountability and fix this with urgency.