Over billing by Telkom and failure to rectify

I took out a Telkom 20MB uncapped Fibre and landline package in January 2018, for R1007 per month.

I eventually had to cancel this package after being seriously overcharged via direct debit as follows:

Feb 2018 R 2766 March R372 April R2240 May 2110 June R1715 July R1714 Aug R1511

After many, many calls to customer service and visiting Telkom stores, the various employees were able to confirm I was being overcharged due to the correct discounts not being app****, but not one of the many individuals have ever been able to refund me for the amounts that Telkom have incorrectly overcharged me. This is unacceptable!

I request an investigation and a report back with the corresponding refund as deserved. My account number is ********** 24.