VW Menlyn - worst service ever received.

I took my vehicle to VW Menlyn on Monday 20 January 2020 for a major service and to have the Megatronix replaced, On Wednesday 22 January 2020 I contacted them on various occations to confirm when the vehicle will be complete, we were eventually told that it would be ready at 15:00, on our arrival the service book was yet to be stamped, we had to then wait for them to locate the service book which they misplaced. To my horror we were told that we needed to swipe our card 5 times as it is more than R10 000 or a 4% fee will be added??? Who is paying the bank costs??? I am already paying over R40 000 for the service and megatronix replacement. On Friday we realised that once the vehicle is in manual mode the screen does not reflect in which gear the vehicle is in, and that there was a strong diesel smell, the chip on the window which I have also paid for to get fixed is not done properly, they indicated that they will however pay me back for that. I took the vehicle back, till today 27 January 2020, they are still busy with the vehicle, they do not know how long I still need to await for the services which I have already paid for (by the way, I have to follow up constantly, they never contact me first).