Very poor and unsatisfying service

I have never experienced such poor and unprofessional conduct from a company that is a so called reputable Insurer, a quote was done by NetAssess a partner of Momentum Insure for repairs to my vehicle as a TP, they paid out following the quote and I then booked my vehicle in for repairs at their nominated panel beater and the panel beaters advised NetAssess that the quote was not 100% correct as there were unforeseen additional damages due to the accident and the vehicle was then fixed fully and completed. However there was non disclosure issues between the Insurers and their Assessing partners of the additional costs and now my vehicle was completed on Thursday the 11th of September 2025 but I cannot collect my vehicle from the repairers as the Insurers have not paid for the additional costs and now I have to suffer for their unprofessional conduct. There is no communication on the progress of the payment and no explanation has been given as to what is going on, I have sent multiple emails but there has been no responses, I asked the claims handler to forward me the complaints department email address but the claims handler did not bother replying to my emails.