Lennards ordeal

I have a third party claim from Dotsure , somebody bump into my car, and their insurance take their time to fix my car. A month later I contact Dotsure to assist me with the claim, knowing that I can't claim from them for the damages on my car. They start acting in the exact way as if I try claiming from them, asking questions doing a background check, call me with more questions, request documents etc. The next moment they tell me that my "claim" were rejected and cancelled my policy. I have dashcam footage of the accident which the lady driver admit it were her fault and yet they treat their client this way.