Poor workmanship

I took my first car to them in 2017 which was a newish Mercedes B-Class. It was for a full valet. The car was clean so all good. I again now too my old 1999 CLK to them for the same treatment. Besides that simple things like the safety belts and sunvisors were not cleaned at all, some of the promised treatments like restored headlights were not done at all. Also some plastics in the car was damaged. It ook the car back and was given a voucher(not what I wanted) , but still when I arrived home the work was not done properly. I ended up myself taking normal household materials and cleaned the interior much better than they did. I also ended up buying a headlight restorer kit for R280 and restored my own headlights. It was a huge improvement. I could have rather saved the R1000 I paid and have done the cleaning myself! I will NEVER take my car to them again. I did not even get a call from the manager/owner after also sending them an email about this. It is affecting their business. How can you not care?