Why does my phone use data with cellular data turned off?

I have problems with my iPhone 5 using data on its own. It usually happens at night, with all the apps closed and plugged in to charge (should be connected to my wifi). Recently, I started turning off my cellular data any time I'm at home out of desperation to save my data. Last night, my phone used 6MB of data with my data off, plugged in. I use My Data Manager to track, it matches up with AT&T's record of my data usage, so I'm pretty sure the app is not wrong. I have the 200MB plan, so I have to be very careful and it's incredibly frustrating to wake up and find 6MB gone when cellular data was turned off. Does anyone know what's going on?  I haven't bothered calling Apple or AT&T, I never get anywhere with either one.

I'm not familiar with My Data Manager but from the name I would think it would tell you what app or apps have used the data and that might help narrow down the problem. If it doesn't have that information, you can go to Settings > Cellular > Use Cellular Data For and that shows usage by each app and if you click on System Services in that list it will also give details of that usage. The numbers are since you last reset the statistics (bottom of that screen). With a little time and detective work you may be able to identify the cause.
Also, there have been many discussions on various internet forums of AT&T (and other) reporting of the time of data usage not matching the actual time of the use. The usage numbers over a number of days for example are accurate but usage reported at 2AM may actually be a summary of some types of use that happened the previous day.

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