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You can use activity monitor on your mac device and see which process of mac is using most of your data.
Please visit below website official website of apple to get to know about this tool: -
You need to click on "Network " to see the exact process who is using most of your internet bandwidth.
Let me know if you face any problem with it.
Also, to save internet bandwidth , I would recommend you to turn off Spotlight and Bing Web Searches
Turn off Spotlight Suggestions and Bing Web Searches
Choose Apple menu > System Preferences, then click Spotlight.
Click Search Results. If you see “Allow Spotlight Suggestions in Spotlight and Look Up,” deselect it. Otherwise, deselect Spotlight Suggestions.
Deselect Bing Web Searches.
Do you see screen like this in your activity monitor ?