No service, breach of contract - bunch of *******

During the month of July I purchased a re-occurring data bundle (100Mb x 6months) additional to the standard data that comes with my cellphone contract. This re-occurring data bundle should reflect on the 1st of each month. Up until now nothing has reflected on my account balance. Now MNT charges me out of data rates which is ridiculously high as when compared to their competitors CellC. I have to carry these costs even though the problem is on MTN's side. After bringing this to MTN's attention through their useless call centre they tell me I should phone back for feedback in a few days time - what type of service is this? After trying to phone back yesterday the consultants dont answer the phones. This is unacceptable service. In short you pay for something you dont get while they charge you out of bundle data rates which most likely they wont refund you on.