ROAMING NOT WORKING - FRUSTRATED

I have been complaining about my international roaming that has not been working for the past month. I phone the call center regularly to no avail. Nobody knows whats going on. On the system everything is allegedly in order. I get advise that I have a limit on my phone and that is why I cannot roam. However I have had this limited since the day I got my phone and the roaming use to work. I anyway use to get billed additionally for roaming. It should further be noted that some consultant have advised that the limited on the phone is only applicable in SA not whilst you roaming. When I try make calls internationally it get a message on my phone that says I am not registered on the network. So clearly there is technical problems by MTN that needs urgent attention. I am lossing income and I am going to obtain legal advice on this issue. It needs to get fixed. I cannot do business like this. I don't understand how your roaming works one month and the next you cant. I have even been to an MTN store for them to reinstate my roaming. The call center has reactivated my roaming services , nothing works. This is really poor service and as soon as my contract expires I am change networks