Caught out in a lie and terrible customer service

I booked my car in for its service on a Monday, including extra work to be done on a car door handle (had to be pulled twice to open). I was not phoned by my service technician and only contact was by the driver for pick-up times. When i arrived I was told that the car door lock was ordered and I would have to be back on Thursday.<br> I arrive on Thursday, the new lock is fitted and all is well. The following night (in front of a sign warning the area was prone to hijackings) my car door unlocks. It continues to do so (whether locked manually or not) and can only be locked under 20km/h or when the car is parked. I phone on Saturday and Rivonia has no mechanics on premises to assist.<br> My only next available time to visit VW was the following Thursday as it was highly inconvenient to visit a THIRD time. I wait for 2 hours only to be told that a part has to be ordered from GERMANY because it is VIN specific and will only arrive in 10 days. I complained via Email only to be told the same thing once again. I then find out that all VW parts are locally manufactured and the part has been replaced within a day at VW Hatfield. <br> I dealt with Willem, Mandla and Lee-Ann. (mechanic unknown).