Double debit from vodacom every month

I had a complain about the amount that vodacom insurance debited from my account last month and it was said as of this month and amount or R335 will be deducted to my surprise they debited R683,05 which is not as pee agreement and is an inconvenience to me financially. Do I now reverse and do a direct deposit on my own monthly because vodacom insurance fails to cooperate and they keep on lying whenever I talk to them over the phone?