Telkom *****ing money due to their mistakes

I have upgraded my Wi-Rooter contract with Telkom in November 2018 where I received a new rooter device. Telkom never cancelled my old contract,so I have been billed for 2 contracts since then.

In April 2019 I went to a Telkom store and they said the cancellation is still pending ( for 5 months) I requested a cancellation and refund of that money as I never used the data on the old contract and don't even have the old sim card anymore. Telkom sent me an sms on 15 April 2019 saying the query is resolved. 30 April 2019,still no refund and another debit order went off. I called from my vodacom mobile number and was on the phone for 15 minutes with and agent. Her answer to me " There is no debit order on their side that went off and I have to phone back in 24 hours to see if it is reflecting on their side or I need to e-mail my statement while I am on the line with her " Meantime I might cut her off and use all my vodacom airtime as they can not phone me back. Regarding the refund. The case was closed with a note saying they are not gonna refund the old contract's money as I received the data. I told her I do not even have the old sim card and why would I upgrade,I wasn't even aware the old contract was still active.

So no resolution. Telkom is still *****ing my money for something I am not using.