Not receiving OTPs

I have been trying to convince Telkom that there might well be a problem with their network since I am unable to receive OTPs for purchases using their network. I have Telkom as a service provider for LTE at home and on both cell phones. I can receive OTPs if a vodacom or MTN hotspot is used but not from my Telkom mobiles or via the home LTE on my PC. Please can something be done. We are in quarantine And are now not able to use hotspots and it’s our only way of ordering in food. We are currently paying R1500 plus for a service with problems. ***