My contact expired last months but telkom still de

My contact expired last months and I went to telkom store and fill cancellation form. But a month later no cancellation has been processed and telkom continue to debit my account which is ********. When I go back to store they told me that there's nothing that they can do. I honoured the contract for 24 without network but I can not continue to splash money without service and out of contract. I want this contract to be terminate with an immediate effect. My contact number is ***