Reliance Jio Infocomm — data exhausting automatically

Address:

Jagtap Nager, Vrind Appt, Pune, Maharashtra, 411040

When my data is off. Background apps are closed and not running. Data is exhausting almost everyday. This is happening with me everyday without using any internet. The data is off. My internet usage is normally 700 to 800 mb per day because i use wifi everytime. Even background apps, updates are off or closed. So how it is possible. Happning everyday.