Dishonesty and Unfair verdict

I lodged a claim with Miway as my insurance company on the 11th of May for my damaged sunroof on my vehicle after several calls to them about the claim all they kept saying is we working on it for more than two weeks trying to discredit me that I put tha sunroof on the vehicle myself. Took tha vehicle to be assessed and I called them again after two days then they told me they just received tha report they claim the assessor says the sunroof is not factory fitted, after several calls to them and bad service they told me I need to submit proof to them that the sunroof is indeed factory fitted. I then got my OTP from tha dealer sent it to them which gave proof that the car came with the sunroof from the factory then they changed they story to I didn't mention it to them that the car had a sunroof which I find unfair and disgusting as the sunroof was never an extra. I'm still waiting for my rejected claim letter for three days after they promised me to send it the same day I'm soo disappointed by this as I feel I was treated unfairly in the due process. Claim Ref No: C632432