Pathetic service from Vodacom Insurance

I canceled my insurance with Vodacom months ago. Last month an insurance charge was mysteriously added onto my statement and I was charged via debit order. The same happened this month. I have NOT authorized this! It is *****. I have tried calling the customer care line but wasted loads of airtime being on hold or transferred from department to department. I have emailed several times and have received no responses besides useless automated responses. The insurance is a waste of money. Before I cancelled I needed to have my phone fixed but the insurance would not cover what I needed. So what is the point??? I demand answers and a refund for the charges I did not authorize!