Putrid Service Mercedes Benz SA

Car was taken in for repairs and after a few days given back to owner after repairs was completed. However I was not happy with repairs because the same thing still happen with car and an additional message coming up. Thursday 22/02 car was given back by Mercedes Stellenbosch and Monday communication was given to them something is still wrong with car and a subsequent message also came up on the car. At that time the car's maintenance plan expired on the Saturday 24/02 . Now they claim that the maintenance plan expired and I must pay for the repairs done. It's also now established that some of the information given by the owner was also not stated on the job card of which the owner has not signed the job card when handed over the car, it was said verbally the faults x3 of which only 2 was resolved. It's now just all about the plan that ran out and nothing about their service given. The customer's service means nothing to MBSA. I must now just pay and accept their poor service for not finding the root cause of what was wrong with the car before the additional message came up.