aggrieved by oaksure insurance broker

I am extremely angered and frustrated at the level of service i have been receiving from oak sure (insurance broker) and lion of Africa (insurer). My vehicle was involved in accident on the 6th of October 2018 and all the relevant documents were submitted to the insurance broker for processing. subsequent a vehicle assessment was done which indicated that it would be uneconomic for the vehicle to be fixed. I was then advised to request a settlement letter from the bank in order for the insurer to continue with the process of finalising the claim which i did and provided oak sure. and i have been waiting for the lost of agreement from the insurer. Today when i spoke to insurer i was told that the will no longer be doing the lost of agreement but have opted to appoint an investigator to investigate the claim and i have to wait an additional 10 working days. I have been paying for insurance and the car instalments for two months (October and number) now, for a car that i haven't been using, that has been written. The insurer is clearly abusing me and I'm aggrieved with the whole process.