Such a Terrible Service at a BMW Approved Dealer with Driver blamed for damage to radiator on a 2km journey. HOW???

Love my MINI Cooper S 2013 but highly disappointed with her servicing at Sandton Auto. I've driven a MINI for nearly two decades. This is my second. Purchase DEMO 2013 from Melrose Arch with only 5000kms on the clock. Recently took her in with Coolant Leaking issues for a Service. Sandton Auto "fixed" this by replacing 3 hoses [they replaced one last service].

Gleefully fetched her paying R12,000 then I drove her 2kms or less from Dealership to Hyde Park Centre - at the traffic light I noticed steam coming out of my bonnet. Immediately parked her. They fetched her and apologised noted it could be the cleaner used on my radiator. Changed their tune! Couple days later diagnosed 'new' damage and noted this would be another R7000 (at cost) to repair. Also noted that I had caused this damage. What?! I'm incredibly skeptical that's the case. Not to mention just paid R12,000 for repairs. So 1. They didn't Fix the issue 2. Blamed me for Fresh Damage to my beloved car 3. Charged me another 7k. Taking out a LOAN to try pay this. First they offered me 110k for trade-in vs. 80k now to buy her noting they would have to fix radiator and sell car with Extended Warranty at 20k [so are they passing this cost to me?]. This after reassurances when I first bought her BMW would always buy her back at a Fair Market Price. First Car BMW, Second Car MINI, Third Car MINI. Next Car Suzuki! Disillusioned beyond explanation. Last Time I serviced here there were ALSO after service issues that appeared AS I was driving home. Something very fishy going on here are they trying to hit monthly servicing targets or something. I 100% DO NOT TRUST them any longer. How can BMW allow this dealership to carry their name? I searched on HelloPeter and they are about a 2.4 rating out of 10. What ON EARTH is going on... I just wanted her fixed! Now it's nearly 20,000 expenditure on a simple issue [that was also the issue LAST time I serviced her at nearly that same cost when the cleaned and replaced parts].