Telkom: Cancellation Dispute

I've had no luck trying to resolve a Telkom billing issue related to cancellation!

Towards the end of May I decided to cancel my ADSL subscription with Telkom. Having done this before using a cancellation form sent via email I thought the process would be fairly simple. After doing some research I found out that all cancellations must now be done online. On the 1st of June 2018 I logged into the portal and after a ton of frustration I eventually found the almost hidden option to cancel my ADSL subscription and landline, I entered the effective date for cancellation as the 30 June (as I had read that cancellation requires 1 months notice) and submitted the request. I received reference numbers for the cancellation of 3 products and proceeded to wait the notice period out. During the month of June I received an invoice which I paid and I thought this would be the last invoice for the service. On the 16th of July I received an SMS stating that my case number (corresponding to the cancellation number) has been resolved. A day later I had no more ADSL service. Later that month I received a bill from Telkom for the full amount for the month of July. I called the billing department and logged a dispute on the 26th of July as I don't see why I was billed for the full month even though the cancellation requested date was the 30th of June. I have absolutely no problem paying a prorata amount for July but I have now been billed in full for August as well for a non existent service. I have called in and used the online chat facility numerous times to inquire about the progress of the reference but I have just been issued new reference numbers and get told that it will be handled in 7 to 14 business days, well in case you clowns cant count it been 24 days since I have logged the issue and this problem is still not resolved. Dear Telkom, please sort out the clowns in your circus you call a business. Please issue me with a final invoice for the prorata amount for July so I can pay it and end this matter. From this day on I vow never to use another Telkom product again! Your incompetence is first class.