Totally shocked by Audi's poor services

Took my Audi TT for a service at NTT Paarl on 2 Feb, the experience was dismal, car was only done by 18:30 after checking it in at 07:30, not washed, couldn't supply me with an invoice, insinuated that someone who previously worked on the car damaged my oil seal (I dare you to say this to the Audi Service Centre who handled the previous service), didn't replace light bulb as requested, has in the meantime refused to reply to an e-mail I sent them, in general a nightmare experience. Sent Audi SA a complaint on 3 Feb, up to date Audi hasn't bothered to contact me, I am totally shocked and have never been treated this badly by Audi. I am now seeking legal advise re the invoice that wasn't supp****, and will make contact with Audi Germany since they have a brand to protect and since Audi SA obviously couldn't care less about a customer complaint. If they couldn't be bothered to reply to an e-mail in 7 days, then I don't believe that they are willing to deliver any form of customer service. As for NTT Paarl, I will never, ever have my car serviced there again. Never.