Lexus Sold me a DUD !!!

I am disgusted by the sale from Lexus Fourways regarding my 2018 BMW X5 M50D that i bought from them. When i bought it, it had a coolant error and they told me to fill coolant. When i did, it came back after a week. They booked it with BMW fourways twice and was told its fixed but still came up. I have been a BMW fan for many years and we have 3 x BMWs

I feel like moving away due to the lack of skill, lack of attention, lack if accountability

My car was sent to BMW Fourways and BMW Midrand several times for the same coolant error, over the last several months, and every time they claimed from maintenance and told me its fixed.

It was NOT fixed.

I keep sending it back and being inconvenienced.

Now, the motorplan has expired in April 2023, and the error has been back but im told that they not sure what the issue is and they want to charge me R21 000 / R72 000 to strip the car to check. I declined this as i said its not my problem as they should have done this under motorplan. Lexus should resolve this as they sold me a car with an issue !!!