Solution - Disable roaming by following the following steps: Dial *180#, enter # to scroll down, choose option 12 (Manage TelkomSA-R), disable TelkomSA-R.
Same here mine I even tried opting out using *180# then option 12 immediately when I opted out I lost connection from data to network I had to insert the sim card to another phone to select 2g network preferences and opted back to Telkom R which doesnt allow me to use my night data