Prepaid billing

Ive been with the mtn for a very long time but there's so much about this network that disgust me recently, i have phoned the customer servce on the 13 of April 2016 and was advised they will forward my query to the technical experts and I've heard nothing up to date, isn't a data bundle meant to be used for all those data connections but a flipping mtn will chow my airtime for data connections while i still have budles remaining in my account, the customer service is so *********** and feckless, not forgetting to mention the amount of drop calls I'm experiencing as well as the inconsistent of the network coverage, mtn stop *********** my airtime as I'm considering to change this network.