UNABLE TO RECEIVE SMS' FROM OTHER SERVICE PROVIDER

Since Friday afternoon 8th May I have not been able to receive sms' from any other service provider other than MTN. I cannot do my internet banking as my Bank cannot sms me a verification code that I am in fact transacting on line. I could not even receive 1 SMS for Mother's Day yesterday. I have phoned MTN customer care who, after lengthy delays are not able to sort out the problem. I've been told to call the Network Division, which merely shunted my call on to another Customer Care agent. I was finally given a number to call the Technical Division who looked into the problem but could not resolve it, so now they have escalated the matter to their ENGINEERS. I AM TOLD THAT IT COULD TAKE 7 TO 21 DAYS TO RESOLVE THE PROBLEM. This is totally unacceptable as I am billed monthly for sms'. If people cannot sms me I am not able to respond to their sms' so my sms bundle is absolutely useless. I was finally given a reference SMC/***. How long am I supposed to wait for someone to sort out this issue? I have been a loyal MTN customer since 1998 and have kept my same MTN number all these years. It would appear that MTN does not care about their loyal, long standing customer