MTN - quick to take payment but don't deliver

In September I upgraded my contract and later that month I purchased long term data (2 gigs a month for 12 months for a once off fee of R1399) . Last month I decided to migrate my package as I was not using the number of minutes , I was charged a fee to migrate . Since then I haven't received my long term data . The call and service centres are useless with untrained , uneducated staff members who are unable and not willing to assist . I have been with MTN since 1996 and have already enquired about a contract buy out from Cell C . I have already logged 3 incidents with MTN with no feedback at all . I will be taking legal action should this not be resolved .