Breach of contract

I tried to activate sms roaming after a trip to a neighbor country. Firstly the sms roaming did not work properly. Since coming back I have been unable to make or receive any phonecalls, sms, or access data networks. This has been going on for the past 5days! Numerous calls to your call centre are just met with incompentance. They can't even get the nature of my problem correct. I keep being told that the problem will resolve once the network updatea. So for past 5 days I have been paying for a service that MTN is unable to provide. I see that as a breach of contract on their part.