Worst customer service ever

So after being dropped off nicely, i get a call from a lady called Nwabisa telling me about a valve they must change. I call her back after 5 min to agree but i cant get hold of her so i leave a message with reception to say, its fine, replace the valve. 30 min later after my meeting i start phoning Vw to a point where reception dishes the works" Nwabisa is not doing her job"!At this point the poor lady has been putting me through for a good 30min. I then stop everything and persistently call for a good 1h30 until Nwabisa calls back to argue that she called me and i didn't pick up. That's that! I am told the workshop closed at 5 and nothing has been done on my car. After speaking to the manager, reception, vanessa, reception, someone else and the manager, Vanessa says please give me your address and i will come fetch you. Now, my car is still not fixed, i spend a good 3 hours on the phone to/with VW also spend the whole day without a car and nothing has changed!