Deduct device insurance without consent

Vodacom keeps adding device insurance without our consent. We have to call them and then call Vodasure to cancel , this takes several days and hours to get this canceled and then a month later, guess what they add the insurance again, take money off our account and all without consent from us. Surely this behavior is ******* and completely unacceptable. Shocking behavior for a large corporate. Now we need to again call for days and months to cancel in the meantime they gladly take money from us.