*****ulent Outstanding Amount

I sent an email in May 2022 to cancel my contract with Virgin active, I recieved a call in July and resent the cancelation email to an agent. I heard nothing back and my account was not debited again.. I recently joined again and I was told there is an outstanding amount of R3780 and I need to settle this before I join again.. Surely I am not liable for this amount as no one contacted me in regards to this amount outstanding..