iPhone 4s extreme data usage

Hi. I've noticed that my iphone 4s was using wi-fi and 3G to automatically download and upload a lot of data when i was not using it.

When i used iNetUsage to see what apps were using the data, i noticed an extreme usage by the process "com.apple.itunesstored".

(I tried deleting "downloads.28.sqlitedb" from the "media/downloads" folder and the data usage decreased, but i don't know if this is the best solution, since this is the fix related with freezing and purchasing problems on itunes.)

Can you please help me correcting this big data usage problem related with itunesstored?

Thanks in advance.