Its not just roaming, its continual crap like links to download the Telkom app, and whatsapp support - every 30-40 min is another SMS.There is some USSD option to not roam or attempt to roam on VC. I am browsing this on my phones Telkom SIM and get no such SMSs ever.
Reporting the numbers as spam and blocking them seems to be helping.
EDIT: now with roaming disabled an hour ago, I keep getting this
Currently you are NOT able to roam on our partner so that you can best use your LTE bundles. To enable roaming, dial *180# select Manage TelkomSA-R to enable
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