Horrible service from call centre agent once you cancel your contract

I have called the call centre twice already, why is my account in arrears if i have closed it? call centre agent said see will send a letter to MBD instructing them to remove my name and stop calling me. all this over a measly R114 which Virgin Active could not even call me about. Agent was supposed to send the banking details, but i never received it. how pathetic can one be.