Virgin Active is robbing us ..out of our hard earned money.

Last year I cancelled my membership with Virgin Active after paying an arrears amount of R2000. I was out of my initial contract , surprisingly in February I got an email from virgin active to say that my account is 3 months in arrears , and it said all out of contract accounts are cancelled.I called the customer service to confirm if my my account has been closed, she checked and it was still open even after cancelling it.I then requested for it to be closed , she confirmed it has been closed.I asked if it has encured any charges and she told me they have a problem with their billing System and that she will get back to me, which she never did. Later this year I got an email from Virgin starting I owe them R5000 , saying the are arrears incurred from last year and the charges my account is still open.Yoh I wa surprised to learn that my account was never closed.They only closed the account last month April . Virgin active is busy robbing people and it is not okay ...how come they have a bunch of people whose membership were not cancelled on request.