Complaint- Mercedes Benz SA

I received very poor service from Mercedes Benz in December 2018 which eventually led to my complaint. Following the poor service and a broken down vehicle MB offered to rent me a vehicle until my vehicle was fixed and to get me back from Kwazulu Natal to Western Cape. The car rental company they have contracted was Europcar. On completion of the rental, Mercedes Benz still owed money to Europcar but seeing that the vehicle was rented in my name Europcar requested the money from me. I told them it was owed by MB and not by me. When I rented again from Europcar in May 2019 they wouldn't give me the newly booked vehicle unless I paid the outstanding amount of R2618.27 outstanding on the previous rental. I had no choice but to pay. I was furious and took it up with MB South Africa. They requested bank statements from me as proof of the payment which I have provided. They are just not coming back to me and the case has been dragging on since May 2019. They are not disputing the claim but have just disappeared. I need your help to recover the money from MB South Africa. I have all the correspondence available if needed.