Pathetic service from Mercedes Benz

More than 3 months ago (19April 2022) I called Mercedes Benz to get the original car registration for my late dad. I was assisted by a lady Mildred Masango who promised that the paperwork will be posted to me in 4 weeks time. Four weeks later I had to call her and she told me that they would have request traffic department for them. I waited another 4 weeks and sent more than 5 emails following up but with no response to my emails. I called and after numerous calls she answered and told me to wait another week. I waited the week and followed up again this week with 2 emails and still no response. The vehicle has been involved in a car accident and we can't even claim as Mercedes Benz has the original papers, our insurance has called numerous times wanting to find out what is going on. We are inconvenienced as we are without a vehicle all to the incompetence of a Mercedes Benz employee.