Telkom ripping us off

My contract came to an end and I did not want to renew it. I sent a Cancellation form on 27 December 2017. Got a response on 02/01/2018 informing me that my cancellation was successful. I did not expect to be debited on 25 January 2018 but Telkom did. I then disputed December 2017 the January 2018 debit order on 26 January 2018, on 31 Jan 2018 they debited R 118.00 which I again disputed same day. On 16 Feb 2018 funds came into my account and Telkom debited R464.68 which I queried with their call centre, according to them they charged me R 284.00 for disputing and R118.00 for Dec and Jan and the rest I don't know. It didn't make sense why they charged with R 284.00 for a dispute of only R59.00. I'm not a happy client and I don't wannt any dealing with Telkom. I want my money back! otherwise I’m taking you to the Ombudsman