Refund for my money

I am having a bad experience with webafrica about billing. They have been debating on my accounts from twice each month from July 2024.I have been complaining about this mind you there are no way to contact them directly but only speaking to a consultant on whatsapp. It's been over a month now trying to get my money refunded with no success. This month I had to block my credit card so that they cannot deduct on both accounts but I am told that they will cut the service if I don't pay even though they have deducted money on my other card.They have told me to go check with payfast and they told me they only deel with the them but they continue to deduct money on my account every month without my permission.. I don't know what else I can do to get my money refunded to me.Is there any advice on what can I do to resolve this matter?