insurance cancelled for no reason.

when I took out my 3 contracts on cell C I took insurance for all 3 devices. so one of my devices got lost I was told I have insurance for only one device when I tried to claim it in may. I asked what happened to the insurance for the other devices I was told that it was cancelled. when I asked for a reason for the cancellation I never got a response. I have never missed a payment. I have been paying the same amount of money as I was when I had the insurance. I was never called to be informed that my insurance is being cancelled and for what reason. I was told that someone will call me back but no one ever did. all they have been is rude. only one lady tried to assist but she also left me hanging. to this day I don't have a device or a valid reason on why my insurance was cancelled. yet I continue to pay every month for a device I don't have. I just want my device back.