Motorola Defy :: Can't Shut Off Data

I am using the 200MB per month T-Mobile plan. I have used the Motorola DEFY for about four months now and haven't had a problem with it randomly using massive amounts of data at once. My bill recycles every 27th of the month, and a couple days ago, my phone used up 100 MB of data in one day. According to the phone usage app, the phone was continously using data during the hours I was asleep (even though the WiFi is ON). This has never happened before, and I am almost at my 200 MB limit because the phone keeps using data. At this rate I will hit 200MB probably this week, waaay before the 27th and I don't want to be charged for the extra data that I didn't even use. I tried going to Settings --> Data Manager --> Data --> and Background Data and Data Roaming were UNCHECKED. But whenever I go to #932#, my data usage keeps creeping up and up.