Data billing complain

On the 8th August 2014, I was shocked by my data balance of about 500MB on my data sim ***) after I recharged it with 2Gig and got free 2 Gig then had a total of 4Gig. I only use this data for my e-mails and Internet browsing not watching videos. <br> <br> Beauty said after checking with the supervisor my data balance was about 5 gig and I said can I speak with the supervisor to confirm my data balance after she could not be able to send me the call reference number. I then got to the supervisor (Michell) and she was very rude at first and told me to hang up and she will call me back and I refused because of my previous experience with MTN call center empty promise to call back, and she told me whether I like it or not she hanged my call. <br> <br> She called back and she could not help me as the answers she was telling me were things I could access on my MTN application that I use to monitor my usage, I then requested that she escalate my call to the next supervisor level and she said there is no shift managers on weekends. She can only send request for them to attend to it within 72 hour from today and she gave me a call ref no:SMC/***<br> <br> I am annoyed by lack of resolution so far