BNA Poor service

I have been doing ups and down with BNA even exchanged emails with their aftersales team and nothing is being done upon my request, I bought a car from them which was involved in an accident and only saw that when I took it to Audi Hatfield in Pretoria. Then Audi SA went to check the vehicle an confirmed the vehicle was indeed involved in an accident, I took it back for repairs then when they returned it my boot cover was missing and I have been asking for it since December 2021. Aftersales now claim they have sent me the boot cover yet I don't have it to to date. Seeking help from hello Peter