Disappointed by terrible service from Miway.

I’m so relieved to have my vehicle back after a very stressful, emotionally and financially draining experience. My vehicle was involved in an accident on the 13/05/19 and taken into Miway’s appointed and authorised (Denver Autobody) panel beater on the 28/05/19. The following day I was informed by the panel beaters that Miway had authorised the use of alternative and second hand parts on my vehicle. After following up with Miway, basically I was informed I had no choice either than to take a pay out (based on assessment estimate) as the warranty on my vehicle had ended. I was and still confused as my premium did not decrease when the warranty ended, instead its been going up together with the excess. Despite all of this, the completion date was indicated to be the 21/06/19 however on that day when I called in I was informed by the panel beater that they did not have the authorisation for additional parts from Miway, however even with my busy schedule I was calling every day during that week and this was not mentioned. The car was then completed on the 27/06/19 but I was only informed on the 28/06/19 when I called in to follow up. The courtesy vehicle was terminated on the 17/06/19 and since then I had to hire a vehicle from my own pocket as I need transport. I also had to take my car back on the Monday (01/06/19) as the back passenger door was not working and the left hand door was not blended/ polished completely. Even though it can be seen that the bumper and the left hand head lamp are alternative or second hand part I have accepted. The only thing I wish fo is the recovery of my excess as the accident was not my fault.