MTN Data Disappears & no one wants to help

I loaded 1GB data bundle on my MTN sim card and it was depleted within 3 hours without me logging onto the internet. i called the call centre at 21:13 and was promised a supervisor would call me back. No one called and 4 hours later i called them and forced to speak to a supervisor. The supervisor, Tshepo Maleka, was not usefull at all and even assured me that he would not reimburse my data because his system is right and i the customer am wrong.