MacBook using too much data but noting is running.

Why is my MacBook eating up a lot of my data but I didn't update or download anything. I can't be on Safari for a minute without taking up 20MB to load. I did my research and some said I should disable automatic updates and turn off spotlight suggestion and Bing web searches. Some also said that it may be "nsurlsessiond" in activity monitor. But the problem isn't resolved yet. I'm so fed up I can't use my hotspot or any other wifi to be honest. I hope someone can help me in resolving my situation right here.