MTN SA have informed us that the issue has been resolved.
Posted May 24, 2021 - 21:57 CAT
Investigating
MTN SA are currently experiencing a delay in returning delivery receipts for a portion of messages. Please do not resubmit any messages that you believe may be affected.
Type: DLR Delays Impact: Customers may experience irregular delivery with inconsistent delivery receipts when sending towards MTN SA.
We appreciate your patience while the operator works to resolve the issue and we will keep you updated.
Please contact support@smsportal.com should you require further information or assistance.