Unhappy customer

I cancelled my insurance 3 months ago, but they debited my money. I went to Capitec to reverse and asked them to block the insurance and they said they blocked it. It was again debited the 2nd time and had to reverse. When they debited for the 3rd month, when I went to reverse the bank said they can't reverse my money because the insurance did a debicheck so they can't assist me. Now R1374 can be taken from my account and my bank would say there's nothing they can do.. How is that possible