Data bundles

hi - i loaded Data bundles on Monday and Tuesday and 100MB each and my data has gotten finished within half and hour and i didnt use my phone- i have an iphone 6 for a year now and havent had this issue before. no app were running in the background for my data to be finished that quickly. <br> <br> furthermroe MTN gave me that night express promotion which 20MB has been lasting me 3 nights now. so how is it possible for me to load 200MB in 2 days and it been finished that quickly yet 20MB that MTN gave me on Promo is lasting me 3 nights and i have been using my phone more after midnight than i do during the day.<br> <br> also the call centre staff - your super champions are not helpful at all. they are rude and pathetic and i have asked for the supervisor to call me back and till date no one has called me. i made 5 or 6 calls and no one has answers for me and i am not wasting anymore money on buying data that will be finished in half an hour.<br> <br> check your network as this isnt right that my data is getting used up this fast and expecting to buy more data after the prices going up as well. <br> <br> i need some sort of resolution this and an apology as your staff doesnt do anything to help!