Shocking treatment of loyal customers

Bought a Caddy Crewbus and 2 Caddy Panelvans. THe crewbus is 2 months out of the 2 year warranty and the alternator broke.The one panelvan is just over year old and had to replace the clutch. VW quoted R12000.00 for a new alternator. I asked for goodwill to be shown as it is just out of warranty and they only offered us 33% goodwill. I phoned for a new alternator from Bosch and they R1350.00. A massive difference in price from VW brand of R12000.00. We declined their offer and asked if the goodwill can be used to settle the dealers charge for diagnosing the problem. VW SA said that they can't do that. SO i'm having to pay the dealer thousands for diagnosing the problem on top of a new alternator. In 20 years of driving their brand and numerous different cars from VW I have never had a alternator break. A little bit more goodwill and understanding would have gone a long way.