Total ineptitude and arrogance from Discovery claim administartors

The agents at Discovery are totally inept and have no idea how to do their jobs.I had a chip repaired on my car's windscreen. Discovery paid out R3737 to Autoboyz for a job that was supposed to cost R500. Then I received a mail to let me know that my annual premium,after only 1 year with them, is increasing by more than 12% due to my claims history! Although I had ZERO claims as the chip does not count as a claim. 4 months later and they will not fix the mistake as, according to them, a repair and replacement is viewed as the same thing???? The job was done so poorly that my windscreen is now cracking in 2 directions. I contacted Mercedes Benz SA as my car is still under warranty and all the sensors are attached in the windscreen. They emphatically stated that I can only have the glass replaced with a Mercedes barcoded windscreen otherwise my warranty on the sensors will become null and void. I provided Mogale Daniel Rakoma at Discovery with WRITTEN proof from the Mercedes dealership as well as the excerpts from my contract which clearly states that NO non genuine parts may be used while my car is under warranty. He absolutely refuses to authorise the claim and keeps trying to convince me and my insurance broker that the ordinary replacement glass will not affect my warranty. Does he think he can override the instructions from Mercedes????