Dead Roaming Service.

I'm stuck outside South Africa due to COVID19. My SIM card stopped working internationally. MTN keeps giving me the same instruction and asking the same questions that have already been answered. Email correspondence have been as slow as once per two weeks. There is no initiative being taken to troubleshoot why their international roaming service has ceased to function. No attempt to communicate with their roaming partner. No gaurentee to secure the phone number and prevent the number becoming inactive due to disuse.