My worst insurance experience ever!

My worst insurance experience ever. My business vehicle was in an accident. Kingprice Assesors left out a bulk of the serious vehicle damage from the quote. I immediately assisted and pointed out all these additional damages that were excluded and even sent pictures thereof. 20 days later my vehicle was still untouched and no communication about repairs(this is business insurance and vehicle is used for daily ops). Repairs only started after I sent an email querying the status of the claim because everyone had gone quiet. After 30 days they insisted on taking their courtesy car, after all these delays. Another 30 days have passed , repairs are not complete because repairers constantly await approval for authorization of all the additional damage that I highlighted before repairs started. Nobody bothers to reply to emails about the delay in authorizations....I copy their managers as well but nobody replies. No authorization, repairs have stalled, no communication, no car hire while I still have to run my business. Throughout the entire claim, I've only seen any action or received feedback after I send email complaints. 2 months and 10days later, I still am without a business vehicle and there is no urgency to resolve. Worst customer experience ever!!!!