Disappointing service from Dotsure insurance .

I haven't had any issues with dotsure aside from.the fact that they have just emailed me and advised me that they are canceling my insurance because I fall out of the risk criteria. I have asked tjem for a detailed explanation .I called im disputing and to date no one has given me a reason or returned my call .I gave all my family about 15 member that she currently insured by dotsure that's excluding all my friends and we are all extremely disappointed. They said that i have a policy till the 10 October. I think in the last 2 years I have only done maybe 3 claims and not big claims small claims .I am covered for contents and structure