Despicable service from Renault Northcliff

I booked my car in for service at Renault Northcliff. I was promptly and very warmly assisted by Charmaine at the service department. Unfortunately Renault Northcliff was not a registered supplier/dealer with my service plan insurer. That is where the disaster began. They took more than 3 weeks to submit the necessary documents because they claim the accountant responsible was off sick. Instead of applying effecient management skills the manager at Renault Northcliff, Alexander Koen, was displaying poor workmanship by not offering an apology (at the very least) for the inconvenience caused and by trying to instill fear of withholding my vehicle until payment reflects in thier bank account. He carried on as if I was insured by an unreliable bogus insurance company. I have used Renault for service for more than 8 years and have never been met with such hostility. The inevitable happened, the supplier registration didn't happen yet Renault Northcliff felt it best to call me to book for a service even though they hadn't received clearance from my insurance. My car is at the dealership as we speak. I am sure Alexander Koen was more than happy about the outcomes. Sick communication, undermining behavior by Renault Northcliff. I will never take my car there ever again and I certainly don't recommend that anyone takes their car in for service at Renault Northcliff.