Cancellation of policy

I was a member of momentum short-term insurance where I covered my BMW f20 and my cellphones in case they are damaged or ******. I was paying well and on time. I did put claims for cellphones only if are ****** or damage of which Insurance is meant for. I was so shocked when Momentum called me to notify that from the first of January 2016 I would not have a cover since they have decided to cancel my policy citing u understandable reasons. They say I am a multi-claimant and as such they are withdrawing their cover. I think they are not fair because they did not warn me or mention a clause where it stipulates the Ts and Cs of the policy. I took the cover knowing that this days is common to be ****** of your belongings or lose a valuable like a cellphone. And to be safe is to insure that. It becomes a problem when I lodged a claim they complain. Okay if they think I am claiming a lot for cellphone, why can't they cancel for the phones and leave for the car. I did not claim for the car since I joined them. I feel that they were not fair to me and my consumer rights were undermined. To add the salt on the wound, they blacklisted me in all insurance companies as a risk. I'm confused.