Insurance cancellation drama

I'm really disappointed with the service that I have been receiving from Vodacom. I had a contract them that ended end of April. I contacted the cancellations department and spoke to Francina on the 25th of May. I asked that the contract should be terminated and that the insurance that was linked to my account should also be cancelled. She said she will do that. End of June they didn't debit so I assumed that everything was in order. To my surprise they debited R305 in July. When I called, I spoke to Victorius and she assured me that the mess will be fixed. Nothing was done so I reversed the transaction in my account. I contacted the department again to verify if everything was done as I requested and this time I spoke to Amogelang. He said he would take the matter up with the relevant people and get back to me. He hasn't gotten back to me yet and it has been over 2 weeks since I called. On the 21st they debited R541 from my account. The amount keeps going up and I don't understand why because I asked that they should cancel it. When I went to the branch (where I took out the contract) they referred me to the call center but when I call, I'm told that they will fix it yet they don't. Can I ask that you please help me fix this because I have been sent from pillar to post for something that I was assured that it was cancelled.