Hello,TshephangMasalila
This issue may be related to the APN configuration while roaming. Even if roaming is enabled and the SIM card has an active data plan, different APN settings may be required when the device connects to a mobile network in South Africa.
We recommend checking the roaming and APN configuration with your SIM card provider.
Also, for security and privacy reasons, we recommend not posting your SIM card number or device IMEI publicly on the internet.