After car- accident effects , no responsibility taken

I was involved in an accident on the 03 September 2018, and the car was towed to Renew-It arranged by Iwyze as my car insurance. on the 2nd October 2018 I collected the from Renew-It after was told that it is ready and has been test driven. on the 11 October 2018 after have collected the vehicle from Renew-It the car just could not start which I phoned Iwyze insurance to arrange the towing back to Renew-It. I believe that the problem was either accident related or repairs related as it could still start during the accident. the following week I was out of town and could not make a follow-up and I returned back to Johannesburg on the 19th October 2018. I phoned Renew-It and I was told that the problem is with the key of the car that the car cant read the key and it is not related to the accident or the repairs they did, the key just needs to be recoded and that happens once in a while with the cars whereby the key will just need to be recoded. I disputed that as my car key is new was recoded at Renault dealership when ordered the new key when my old key could not work. So I phoned the insurance I just can't remember the consultant I spoke to and she promised to revert back to me. I shared my story that I believe the problem is accident related or with repairs and I am told that the problem is with the key reader i must take it to the dealership to recode the key. the consultant did not come back to me. For the next 2 weeks (23 Oct - 2 Nov) i was out of town again gone home to prepare for my brother's funeral and I had to incur costs of hiring a car to drive for about ****ms going home as I needed a car so I could not call the insurance to follow-up on my complaint during the period of 2 weeks. Coming back to Johannesburg on 7 Nov till today 19 Nov I have been calling the insurance and everytime I speak to the consultant I must start from the beginning about my complaint and everytime they say they will come back to me and they never did. the only Consultant i managed to get hold of who came back to me was Brenden Dlamini last week on the 15 Nov who requested that I send him the invoice from dealership to prove that the car key is still new and was coded so it can't be the reader that is the problem with the car. He said he will forward the complaint to the complaints division and escalate with management. Then today when am calling again the insurance i have to state my complaint again to the new consultant I cam across with and I have had it. it has been more than a month now no resolution and I have to constantly make follow-ups it exhausting whereas my premiums are up to date and am not expecting this kind of service at all. I do not know now what to do. I am paying car insurance premiums but i don't have a car with me. Am really struggling I need a car. this is very bad bad service, am still hanging not knowing what is happening between Iwyze and Renew-It.