Telkom - terrible account mismanagement and overall poor quality service

Short version: I am extremely disappointed and angry with the outrageous service provided by Telkom - I want the money deducted from the last debit order paid back in full. If an industry watchdog exists in this country please can someone forward me their details so that I can make contact?

Long version: I had a Telkom mobile LTE account, which was past the contract period on a month-to-month. Upon visiting a Telkom store to find out how to upgrade my existing package, I was advised to manually cancel my existing account and then apply for a new package, which I then did on the 11th of May 2018, and heard nothing back from anyone. Then I received an email on 05 June 2018 from one "Fuzo ********** expressing his "sincere apologies on the inconvenience caused and the delayed response to your request", and advised me that "Order ********** 19A was successfully submitted for cancellation as per request for the contract > ********** 228." Later in June I received yet another Telkom account for R53.58. Upon enquiring this amount with their call centre they advised that not all my account numbers had been cancelled and this amount was for uncancelled accounts, to my surprise. I then logged into my telkom profile and proceeded to manually cancel another 3 accounts that should have all been automatically cancelled along with the parent account ********** 228 as it was all part of the same LTE package. Later on in July I have received yet another account for R138.20. I went to complain at a store and they advised that I would not be billed for this amount, as the invoice needed to be back-dated as per the actual cancellation date - obviously this never happened and I want my money back!