Service menu failure

I have encountered this problem several times, load airtime balance, and trying to buy a data bundle, and having credit exeeding the value of the bundle twofold, a message comes back insufficient balance, Trying to call customer care there is no way to reach any consultants whilst my internet is running at an exhorbitant out of bundle rate, Thus effectively loading R15- airtime with the intention of buying a 100mb data bundle this service doesn't work and therefore leaving me with roughly 15mb, The same as happened on Christmas day 2015, And to further the problem these networks only apologise, Whilst the customer suffers the loss of his/her money often at a awkward time, which I believe this network now owes me a 100mb data bundle at their own cost, since my losses are due to their defects, \apologies don't cover customer loss and inconvenience\" I also believe the time for investigation by consumer ombud is highly overdue, if not legal class action, After all this \"smacks\" of ******* business conduct, For any further info I suggest MTN to wake up, and check their e mails"