Poor service by MMU Northcliff

I have purchased a VW Polo TSI 2016 at MMU Northcliff In February 2024 drove the car for 2 months when it had an engine knock I took the car to an RMI acridited workshop to check the problem as the requirements of the Motor warranty on the vehicle. AT the workshop the noticed that the engine was fixed before and they didn't do a proper job which Led to the engine doing an engine knock. The warranty did pay as they Said it is the fault of the dealership and when contacting MMU they said they won't fix the car as they have given me the car In good condition and they even done service on the car. On the service history the last time the car went for service it was In 2019 when you check the service book and also at VW the confirm the information. The car was not properly registered as the car licence was about to expire and I had to go to the municipality to complete the registration process basically doing something that was supposed to be done by them. I wouldn't recommend MMU Northcliff to my worst enemy they are terrible