Sim card not sending msm's

What's wrong with vodacom customer care line? They do not want to talk to us, been calling since 3rd of Jan, day and night, it always say they are experiencing a high number or calls, like really, there is no longer aplease hold to talk to a consultant option, so basically you cannot get through, I needs help with my sim card, it does not send sms, I tried everything changed settings, checked centre number. Can someone pls call me