Continuing to Debit my Account after membership Cancelled

Before signing up for this "membership" (the call centre assured me this wasn't a contract and I was free to cancel the membership within 20 days of my debit order) I came online and checked reviews... It seems most who sign up with this company experience the same issue. My membership was cancelled in writing within the stipulated time, 7 days later I received an email saying how disappointed they were to see me go At the end of March I was debited again, I sent a number of emails before this debit date asking if the membership had in fact been cancelled and my details removed from their debit orders, all emails were left unattended. After March's debit order, I emailed again asking about the continued debits, as well as the free month each member is promised when they refer a friend. Still no response Yet another month I have been debited, first communication I receive that was not a system generated response is two months after acknowledging my cancellation saying there were outstanding fees...again I asked about my free month for referring a friend, and asked about these outstanding fees I have yet to receive feedback from this company and I have yet to be removed from their debit system.