Poor Customer service from Mercedes Benz South Africa!

I bought a new X350D in November 2018. In February 2019 I was involved in an accident in Botswana. We have been struggling since 1 March 2019 with Mercedes Benz South Africa on supplying the parts for the vehicle, since they didn’t want to do a write-off on the vehicle for the R470 000 damage to the vehicle! We have communicated with various parties including Mercedes Benz Germany and back to Mercedes Benz South Africa with no satisfaction at all!! I have been paying my installment as well as my insurance for 4 months now without any use of my vehicle! Please assist me in getting some definite answers from Mercedes Benz South Africa? Regards