Renault the Glen. booking car for service and getting no updates over 2x weeks

I am soo sad the way Renault is such an uprising brand and I get to experience the worst service provided by Group1 Renault JHB the Glen. I bought Renault as my first car, made a lot of mistakes on it. Yet I took it for a service and trusted they can provide me with the outmost care as a customer. I took my car in for service after 2x service skipped on 10th December 2019, Yes I reasoned with the fact that It was going to take up some time. only received an update or a call from Renault the Glen on 13th December 2019 from Gladness telling me that my car is not ready and she will give me a call on Tuesday to provide updates, guess what? this was the last time I received a call from them. up until this very day, I have been calling them to get updates about my car, its now over 2x weeks and my car still not done. I get to be told my car has engine problems and will need me to pay R4900 for them to check what the issue is and I agreed, however I am still not getting daily updates about the stage of the car...heading to the Christmas eve now still nothing. can someone please just hear me out and help me understand better????????????