Momentum Car Insurance (Triston Moodley), Nightmare to Deal With!!!

My wife and I own cars since 2004 January and this was our first claim, my wife didnt cause the accident, my wife was the 3rd party as the car/lady drove down a hill, straight over a clear lane and hit my wife on the side of our 2016 BMW. This accident has been a total nightmare dealing with momentum. Triston Moodley the advisor from momentum which is handling my claim spoke so nice at first and promised the world, until he was caught out, he sent me paperwork stating all genuine brand new parts was ordered and was going to be installed on my car, when the doors arrived, the both doors were second hand, my spec BMW F30 came out in 2012 and now it's 2019, Triston approved old s**** doors that I don't even know if someone died in that car were the doors came from and yet every year when I phone and ask for a discount on my premium for being a loyal customer and my cars value depreciating, I'm told by momentum year after year that my car value depreciates but the car parts prices appreciate so they can't decrease my premiums but second hand parts don't appreciate in price!!! Till date after the second hand doors was discovered Triston never took my call or responded to my emails, no other agent could help cause all of them keep saying that only Triston knows what's happening on my claim and Triston doesn't update the system, The other agents also speak very rudely to customers. I had to fight till brand new doors were put on my car and Triston never called me once to appologise. Since Triston never updates the system and when I kept calling no one knew what was happening and I was kept on being promised that Triston will call me back which didn't happen. I got tired told the one agent that I was now tired and was going to complain on hello Peter, then only did I get a call from Triston and he promised to sort out the problem and till date nothing has been done and almost two weeks has gone. My car was in perfect condition before the accident and that's all I want back, the car in the same condition but my car is no longer in a drivable condition, one and a half month has passed and nothing is being done. Triston is the one handling my claim and he is point blank ********. I wouldn't mind if we were people that claim continuously but for the first time claiming in our entire lives after close to 16 years for both my wife and myself, this is unacceptable treatment and all our policies are with momentum. I thought keeping all my policies under one umbrella will be a good idea, I now feel like I trusted ******* with my money all these years. Paying these high premiums is there for us to have a peace of mind but to go through this type of treatment yet going through an accident is a nightmare on its own. having to prove every single problem like a child to people that sit in Jhb both Triston and the Assessor that don't come out to investigate the problem and just decline all problems from JHB and we live in durban. They say according to momentum, if the diagnostic doesn't show a problem then to them there is no problem yet a videos was sent to them from BMW and BMW is telling them that there is a problem with my car. I'm not sure what to do cause nothing is being done and my car is not in a drivable condition.