Dissapointed in Service

I am so frustrated, disgusted and annoyed with MTN, I really just want to cancel all my business there. Since the 27th of Nov I have been struggling to get MTN to look at my problem. If I load airtime or data it disappears. I loaded 3 GB of data in one week and I couldn't use it. On the 27th of Nov MTN gave me R210.00 which was gone within an hour. It is ridiculous that I have to wait 10 days without any response from MTN, I have phoned 5 times within this period and every time they escalate the problem because nothing has been done from MTN's side. I cannot use my phone, if I load new airtime or data it gets taken, apparently my problem is not important enough to MTN to solve. Come the 27th of Dec MTN expects me to pay them, funny how that works... MTN solve this problem please, give me back my airtime, data and communication with the outside world, or please cancel my useless contract with you!