Poor after sales service and false information on dekra Report

Do not purchase a vehicle from We Buy Cars based on the Dekra Report because they are not a true reflection of the state of the vehicle. When we took a Mercedes for test drive engine light came on which was not reflected on their advert. Workshop Manager stated was back lights. Acknowledged that engine light was not mentioned or shown in the advert. Private Auto Electrician and Mercedes Benz confirmed that back lights were not the problem. We were provided with a copy of the diagnostic report together with a quote to rectify problem. Sales Rep - Kegan, Jaco - branch and sales Manager, Wayne - regional manager and Simphiwe are all not coming back to us and not dealing with the matter. We live in Port Shepstone so cannot just pop into the branch. Shocking after sales service.