Poor workmanship

I booked my car with Audi Polokwane to have an excessive leak on the cooling system checked in November 2022 and the service done as well .The car went on the 17th November 2022 and i was told a diagnostic will be made to determine the coolant loss problem.I was called abd told that after diagnostig the water pump and the thermostat was the problem.I told them to contact innovation.group to find out if they can cover that and that was approved.The car was released to me on the 23rd November 2022 and while waiting for it i was told the QC technician took for a test drive and when i checked on my cartrack report the QC technician was driving the car at high speed doing 137km in in a 60km zone.The car arrived i was upset and drove off and before i could reach my destination the car indicated temperature coolant high which was my problem and i called and the technician on standby told me it could be due to a vacuum in the cooling system hence maybe the drop in coolant , i stopped at the filling station to top up the cooling system and i told him this is not acceptable. On the 4th of December 2022 i had the same problem ,temperature coolant high and arrange a tow and the vehicle was taken to Polokwane Audi once more.On the 8th i got a call from alerting me that the car is ready .I then emphasized the fact that i will be taking a long trip and this coolant temperature thing will be the least of my expectation. In January 2023 i took a trip to Cape town and on my way back i experinced coolant temperature high and the car failed .I filed a complaint with Miosa and they said i was at fault for driving a car which had a coolant temperature fault, and to make matters worse Audi Polokwane went to an extent of cancelling the claim for November 2022 stating that the job was not done on the 7th of February 2023 after i filed a complaint with Miosa on the 6th February 2023.