The worst service I have ever experienced

After purchasing my new 3 series from SMG Durban and even writing a letter on the outstanding experience I received from the salesmen I never expected aftersales to such a bad extend, it is the worst experience I have ever had at any BMW dealership this is my first time using SMG Durban and it will be the last I took my car in for a radio fault 19 Jan 2016 the found coins in it a said I need to pay for the repairs which I agreed to the aftersales consultant advised that I would have a quote by Thursday when I did not receive any correspondence by Friday I contacted him. He said he will contact the repairer and advice I will have a quote by Monday COB I once again contacted him, he was unreachable left a message he never retuned my call I called again today and again left a message and till now no communication this is utterly disappointing for a BMW dealership as for the car wash my car came out more dirty then when it went out if you not going to do a good job don't do anything at all. this seem to be the only way to get your attention i have been without a radio for more than a week now.