MTN in breach of contract

I upgraded my phone on the 30 November 2014, and received my airtime and data on the 30th of the following months , until January 2015. As it was holiday period , so I made more use of data more than the other months, but did not use up my data bundle. On the 19 January I received an sms informing me from MTN, saying my data was almost finished. I checked with *141# and there was 128 megs left. on the morning of the 20 January 2015, I received another sms saying my data and voice values were ZERO. I phoned there help desk, 808, who could not check as their system as it was not updated, and asked me to phone later. I phoned later and still they could not tell me , and now said it took 24 hours to update their system with my usage. After additional 5 phone calls from then up to 3 February 2015, no one can tell me why it \disappeared". Further they have not credited my account with my reoccurring airtime/data bundle for the end of January. When I questioned this "