Sms service doesn't work

My sms service doesn't seem to be working. I called mtn customer service 173 and spoke to a lady call Cherlise and tried to explain the problem and she didn't help. It's been over 30 minutes and her test sms hasn't come through. I bought airtime via fnb over a day ago and only received the sms this afternoon. I also bought airtime via standard bank app never got it and still haven't received the airtime and sms. I bought unipin electricity and was supposed to have received the pins via sms and I am still waiting. Mtn's customer service and service in general sucks.