Billed for a cancelled contract

<p>I cancelled my Telkom 3G contract on 30 September 2016, but my account continues to be debited each month. Telkom owes me over R500.00. I phoned Telkom about a month ago, and was given a Case Number but, sure enough, was billed again (debit order) by Telkom. Today I phoned again, and was given a new Case Number. But will the cancellations/Accounts Department sort it out, and refund me what they owe, with an apology for inefficiency and poor treatment?</p>