Accidental Insurance Added without my consent

Accidental Insurance was added without my consent. I received an sms confirming my insurance. I immediately called in to enquire what was happening. I was informed by the consultant that there is no insurance on my account. Two days later, I saw my bill was high and I called again. This time the person on the other side apologised and said it was cancelled and credited. Two days later it was still not cancelled. I called again. This time told it was a system error that charged all customers and vodacom advised that if a customer calls in they should reverse and credit. Why don't they just fix their error? Do they want to ***** us if we do not notice their error?