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Have you tried MyAccount and GServices? Both tools tell you how much data you've consumed. *143# also gives you the option to monitor your data usage.
The Gservices app used to have that feature but it's good. I suggest My Data Manager app, it's free and has a lot of customizations for you to manage your data. Just make sure to set it to your cut off date and max GB less 500 mb for allowance.
I think it also measures your hotspot usage too.