DATA BUNDLE EXPIRED BEFORE EXPIRY DATE

I purchased an mtn 60 gig once off data bundle, valid for 12 months, on 09 January 2016. According to the deal/offer and as confirmed on mtn's website a bonus of another 60 gig night express data is also applicable, which i received immediately as well. <br> <br> However in less than a week the 60 gig night express data expired , i did not use a single mb from that night express allocation. According to the deal/offer and as confirmed on mtn's website the 60 gig night express data is valid for 6 months.<br> <br> i called the mtn call centre on 14 Jan and explained this issue and they had no idea what i was talking about. <br> <br> They did promise to investigate and get back to me but have not since and neither did i get my night express data back!. <br> <br> The interesting inconsistency is that my wife also purchased the same 60 gig bundle a few days after, received the night express data of 60 gig , cell no *** and it HAS NOT EXPIRED YET?!<br>