I need my refund from Telkom

Good day I have Telkom contract for almost 3 years and the problem started when my contract expires.What happened is that the sales representative who was helping,she did not cancel the old contract and I end up having two contracts and being deducted for two of them.I went back to the branch for clarity.old contract cancel but now they fail to deduct month end and I end up paying 3 times the value of the initial contact.first I payed to Nudebt collection agency r650 on the 30 June and on the 1 July Telkom deducted r1200 to my account and when ask for refund they say payment to reflecting but only debit order is reflecting and I was advised to call Nudebt but they don't answer my call and in short I feel like I had been ****med r650 by Telkom.