DATA AND AIRTIME CONSTANTLY DISAPPEARING

MTN has been *****ing my DATA and AIRTIME it happened more than 3 times in less than a months period. I called the call center agents and they were very rude and impatient when trying to explain to them what is happening. I contacted the mobile store where I took out the contract and even they were unable to explain to me why this is happening. I am sick and tired of their poor service towards their customer and yes, I am tired of always buying airtime and data although I am a contract user!! MTN is the most pathetic mobile network anyone can be using and I will tell everyone in my power to get rid of their MTN newtork. If they are not *****ing my data and airtime I don't have network coverage for over 5-8 hours!! I dispise joing this pathetic network and I wish foreverything and anything bad that can possibly go wrong with them!! I am going to speak hard and loud about their stinking service!!