Telkom terminates service early and charges me for it - unfair billing

Someone please help me understand. Because the way Telkom works is not normal.

I requested for a termination of their unreliable ADSL service (10Mbps - speed was rarely provided by Telkom) on 29 May 18. I asked for termination on 29 Jun 18. Now basic logic says that is sufficient notice right? No!!!!!

My service got terminated 2 days later by Telkom. But being left without access to the internet was not the only pain Telkom had in store for me. Because now I am being billed, wait for it, "Notification Fee". Calling the Telkom Centre did not help. I hung after being put on hold for 13 minutes. When I spoke to the confused call centre agent - he said it is because I terminated my contract early..oh? So I switched off my service ahead of time? I was on a month to month contract and not a long term contract. What ******* is that?