Q: System service (iTunes Account used high data usage)

Hi, I don't understand but for some reason my data usage for my iPhone 4 jumped DRAMATICALLY just in the past few days. I somehow used over 500 MB of data on my cellular network with just a little web browsing and about an hour of music streaming (something I also do, but typically have about 500MB is one Hour- not three days.

I Was refer and switch off following features

*Turn off auto update and background app refresh

*Reset Settings

*Descries I cloud backup(Only reminders,contacts & notes)

*block Using restriction All cellular Data usage things

*Finally i was log out my I tunes account.

But issue is the Same.

And i have Another issue in software update

System service are showed for software update used 5,or 7 MB data usage. Iphone 4 software update was stopped ios7.1.2.