Being billed by Virgin active 3 months after canceling

After canceling my account in the beggining of July and receiving a confirmation mail from Virgin Active, I'm still being billed. In August, I recieved a mail apologizing for the error and I did get a refund, in September I was charged again, but a lesser amount and still no refund. Now 1st October I was billed for a premium account and received an email welcoming me to Virgin Acive?!?