Virgin Active SA overcharging

For 3 years I have been incorrectly charged for use of gym by me and family. I was consistently overcharged. I engaged with Virgin via meetings what’s app and e mail to try and resolve. I managed to achieve a partial refund but eventually ran out of patience and sent them a formal email removing their authority to debit my account. A month later they debited my account over 2000 rand!! I am beyond frustrated. I hope other customers carefully check their charges. They consistently make “mistakes “ and it is always an overcharge in their favor. Be warned.