A disgusting incident

I took my Audi A1 for a service on Monday the 5 th September and requested that the service department have a look at a warning light that had come on. I received a quotation for the service which included R6500 to DIAGNOSE and quote on the warning light. I refused the quotation, as personally I felt that it was day light *******! When I collected my car yesterday I was charged R1500 for DIAGNOSTICS!?!!?! What diagnostics? I received a quote for the diagnostics? So actually, I was charged R1500 for the quotation to determine that it would cost R6500 to diagnose the problem??!?!!!! I called the manager Albie Smith I asked how they could justify charging me R1500 to quote me to diagnose and a further R6500 to find the problem? The warning light indicated what the problem was… His reply was it’s the 1st step to finding the problem????? Did the warning light not indicate what the problem was? What did I have to pay a diagnostic fee for? I also asked him to explain how he could justify charging R900 labour to change 4 spark plugs? His arrogance and lack of customer service was shocking!!! “If I had 20 customers like You every day I’d would have to close my doors!!!” Who does he think he is talking to? I am furious and very upset!