Sent multiple emails to discovery after receiving incorrect information that has a negative bearing on my insurance coverage

All I can say is that I am currently in the process of changing insurers. No claims from me, everything on my side 100%, they erroneously ask me to install a DQ tracker on one of my insured vehicles which already has a tracker installed, I submit the documents attesting this to them, and they accepted this. A few months down the line, they now state I need a tracker. I've sent several emails to them, not a single response. Disgraceful service levels.