Discovery Nightmare

My car recently got bumped at a parking lot. I was told by the assesor that there isnt an accredited pabelbeater in my area so they chose 1 that i could go to. I requested to use a different service and was told its fine but that they would only pay what the 1st service provider quoted. I had no problem with that. To my shock and dissapointment, i received an email confirming payment but it was less than what was discussed and i wasnt given any information on why the original payment was changed nor a chance to agree or decline the settlement. Ive called discovery numerous times to get answers but nobody seems to know what is happening. Ive send several emails including to the case manager and no reply. Their service is terrible and im considering joining another insurer. Still waiting for them to contact me but i know i will have to be the one who makes the call. Customers deserve better!