This problem is pretty black and white. So I call bull.
I have a 250MB limit. I have it restricted on my phone at 249MB. The bill for this month says I went 2MB over and I am charged $15! My phone states otherwise. My phone states I have used 249MB. The data is turned off because 249MB is where I have it restricted at to turn off. I don't think Verizon is a trustworthy company. As if they really need the money, yet they are so quick to charge someone for miraculously going over their data. This company is just a bunch of crooks.