No Refund for 5 Months

I have cancelled my ADSL line on 28.05.2018, I had to give a months notice (28.06.2018). On 03.10.2018 I phoned as I received my final invoice from Telkom to arrange my credit. I had an issue with the credit amount as I had paid my Telkom service for July 2018 & August 2018, the credit was only for August 2018. I have followed up 6 times (03.10.2018 - 12.10.2018 - 17.10.2018 - 23.10.2018 - 29.10.2018 - 07.11.2018) every time I get the same excuse "I will escalate this to my manager / team leader". I have mail all documents requested for refund to ********** (02.11.2018) and received a confirmation mail. Still I have not heard back from Telkom and I have to follow up every 3rd working day. Is it so difficult to refund a customer that had to cancel the ADSL line as I have moved to a location that does not have ADSL. I need the credit for July & August as money does not grow on trees....