2.5 Gigs of data gone in 2 hours

Good day<br> <br> I bought 1 gig of data on the 23rd of July , of which I was given an extra gig as well as 500 mb night surfer . To my surprise , two hours later I received an sms to say that my data is finished . I did not even use the phone much as I get free wifi at work . I called in to the call centre , which the agent answered after a very long time , and she advised me that someone will contact me and no one has called me and its 4days later !!!!! I tried calling again Friday night and for 30mnts I held on and couldn't go through . The lady who was very unhelpful of course said she will send the itemised billing and nothing is done .<br> <br> I want my data back ... I cannot lose a R160 in a matter of two hours !!! i need somebody that will sort this out for me ASAP . I don't know what MTN is doing but if it means moving to another network that will give me value for my money <br>