Data misinformation

I have had problems with MTN since Nashua Mobile handed over my contract to them.<br> <br> I have had astronomical bills lately with absolutely no recourse in how to resolve this issue. The USSD code *141# is inaccurate when it comes to stating how much data I have left and when I load R89 1 gig bundles on to my contract, they do not appear and the USSD code isn't correctly adjusted. It always tells me I have enough data. But my bill at the end of the month shows NO loaded data bundles and only out of bundle data having been used.<br> <br> I can't gain access to the Mtn site to log in to my account and the only thing I have at my disposal to check my data usage is that USSD number. I have an old Anytime 200 contract. Maybe I have been given the wrong information about how I check my balances.<br> <br> Please help