OK, so I called and it seems I was auto migrated sometime last year to some new package where telkom to telkom calls are free and my wife tends to only call two numbers from our phone (Mom and my work, both telkom lines). Hence all our phone calls are now free unless we call a cell number or something. Overall that halves my phone bill just about.
On the other side I have had two calls in the last 2 months stating copper is being discontinued in my area and we are being migrated to some new wireless tech that I have heard is terrible in terms of line quality so perhaps that will undo all the good Telkom somehow managed here. Will have to see. They keep promising to call me back to give the details but have not done so. If there are further updates I'll post it here for the interest of the community.
Same happened to my in-laws, about a year ago, they were "
auto-migrated" from land line to "Look-Alike-3G" and lost the pensioner discount..
In Aug 2019, they were again "
auto-migrated" again to a voice-call-300 for R300/pm included free local calls, but international was still charged $$$, their monthly bill was ~R500 pm after all the "
auto-migration".
I then "
manual-migrated" and "number ported" them to VoIP (FreshPhone) and their VoIP bill is now ~R100pm - and they phone family overseas much more often.
They have "free" access to internet via a kind neighbors open wifi ;-)
EDIT: No more bill for 1st minute - pure-per-second

The 351 calls to Vodaphone were charged by Telkom at ~R10/min, so a 50m call would have been R500, now R50 on Freshphone
The 083/082 calls were all charged for the the full first minute on Telkom.