Contract not Cancelled on time

Submitted a cancellation form on 21 January to give notice for contract that was expiring on 29 February. Subsequently had to follow up and resend the same form numerous times - 3 February and 22 February to establish whether the the contract will be cancelled or not by 29 February. Followed up again on 29 February and was told to give 21 business days for it to be submitted and take effect. Received an invoice 5 March stating what recurring monthly fee for March will be. Followed up again on 29 March and was told that contract was cancelled, but not given the actual cancellation date. Contacted the call centre again later that day to establish whether or not the contracted amount will be deducted again or not and was asked to resubmit the form AGAIN to verify the correct date for cancellation. My account was debited this morning with the recurring monthly fee (which has now been increased to reflect the \renewed\" contract). Submitted the form well in advance (more than 30 days notice was given) and should not be held accountable for it not being processed correctly on 21 January or within a few days after. I want to be refunded for the monies wrongfully deducted."