Six weeks without a vehicle or an answer

My vehicle was damaged in an accident 6 weeks ago. During this time the assessment on the vehicle keeps changing ( now over s****ping value). Outsurance has paid part of the claim, but are now insisting the dealership and Panel beater reduce the additional costs to below s****ping value. While they are fighting, I am without a car. When I finally asked for the complaints department, the lady from the claims department indicated Outsurance does not have a complaints department. So I can not even escalate my complaint. Feeling really helpless.....