Incorrect balance shown. Costing me hundreds!

I put a complaint on MTN's website months ago about this and got ignored.<br> <br> I use a lot of data on my prepaid MTN SIM, particularly midnight to morning data. I have a huge problem in that the USSD command for checking balances doesn't work! Right now when I dial *141*1# it tells me that I have 270MB remaining but whilst browsing I get the popup window \Yello etc\" telling me that I've run out of airtime and data. What the hell?<br> <br> The USSD gives incorrect data usage and then chows my airtime in seconds. No warning that it's about to expire or anything. This has been going on for months and I've had enough. This has cost me in excess of R700 if I total it up. Then the \"cherry on top\": I get an SMS the next day saying that I used R35 on 35MB of data and then tries to sell me another data bundle. Hello? Not fair at all.<br> <br> You guys seriously need to jack your system up, this is crazy! I'm happy to use you guys as a service provider because your prices are reasonable but this problem negates that!<br> <br> I want to know what MTN plans to do to compensate me for all of the wasted airtime caused by their faulty and/or inaccurate system."