Mtn *****ing from people

I bought 2gig data on the 26 April and on the 8 May all my data disappeared. I called MTN and asked what happened because I normally buy 1 gig and it lasts 27 days. I was told I am sharing data with someone else. I asked who that someone else is and all of a sudden I was told they are not sure what happened and my issue will be escalated. I've been calling mtn since the 9 May and every time I'm told the call centre is off line I must call after an hour. Mtn is ripping people off and refuse to take responsibility, somehow the whole call centre is trained to tell customers they are off line every time their company *****s from customers