Google play store uses data without consent.

[Javrri]

So I have a very limited data plan and I have been monitoring what apps that are using my data with an app called My data manager. I have noticed that Google play store uses a lot of data without my consent. Have any of you noticed this on your devices? Some week ago it took several mb and I did not even open the app. Then it behaved for a few days an now this morning first thing when I turned on the phone it used 19 mb and I don't know for what. If I turn of background data for play store the whole app does not work. And I have turned of autoupdate. So it is not that. I would really like to know what play store does with my very limited data..