Debiting money off for something I did not sign for!

I’m absolutely DISGUSTED in Vodacom’s services. I have been using there services since March, I have been debited every month for a “supposed” insurance that I did not sign for on my contract only to find out know that this supposed insurance was not even for the correct cellphone. I have been trying to request a refund for the amount owed over all the months and Vodacom refuse to give me the money back. I cancelled the insurance because it is of no purpose to me.They say they will only refund for the last month that the debit order came off to find they have just this month AGAIN charged me, they then progressed to telling me I should contact the insurer(Finerite) and query with them and they have sent me back to Vodacom! It’s like I’m playing ping pong between these departments, nobody is actually sorting out the problem. This is *****! Everyone I call telephonically either puts the phone down on me or tells me to hold on the line and cancels the call!