Poor service of bizarre proportions

I was called in to help a friend who has been having an amazing dispute with this company for really the most bizarre behaviour and cynical neglect of his Mercedes car. He wanted to me to try and resolve it as he was just too frustrated to deal further with them. So I called, I spoke to a Customer relations manager, explained the history and asked him to give me a final number for my friend to get his car back. The battery was flat and not holding a charge (this happens when batteries are left in a discharged condition). He came back to me and confirmed that nothing was outstanding if no new battery (R 7 500) was to be supp****. So, we scheduled collection, only to have another fellow from there phone and allege an outstanding invoice! This had been part of the bone of contention before. A wheel had gone missing, had been allegedly replaced, and needed a new tyre sensor, so this was the charge. When I got there, the sensor had been removed, but they casually mentioned that it was still the wrong wheel! The whole saga makes frankly unbelievable reading. Very, very disappointing for a marque like this.