Data usage spike

Hey there, Blackjackmark21! Thank you so much for taking the time to reach out to us here on the Xfinity Forums! I am sorry to hear about the troubles, and thank you for sharing that you reached out to our Customer Security Assurance Team! Can you please send us a DM, so we can dive in the account further with you? 

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@user_cf3xxf​ do you use their modem? If so tell them you want to swap it out. I did that as a Hail Mary and it worked!

Hello, user_cf3xxf! Thank you for reaching out about the data usage increasing vs. what you saw last year. Our Customer Security Assurance team are the experts with data usage and run tests on your service when you reach out to them to verify what is being reported. Have you spoken with that team specifically?

Have you taken any steps such as changing your WiFi password to ensure only your devices can connect?

Another thing that can help to test where the usage may be coming from is to only connect a devices or two, monitor the usage. Continue to add devices slowly and monitor the usage.