I can assure you the internet was not down

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In what way was your internet connection down? Did your modem lose sync? Did your pppoe session drop, even though you had sync? Or, did you have a working pppoe session, but couldn't get anywhere?
Only the last case could be due to us. We only disconnect sessions if accounts are suspended or cancelled. If your modem didn't sync, that is a line issue. If you couldn't authenticate, that is usually a dslam backhaul failure.
I am sorry you had a bad experience with the call centre, it may be better to contact @TelkomZA by twitter next time, or to log a line fault with the Telkom app, or on the website.