I have been an xfinity internet customer for over 2 years. I have never paid attention to my internet data since I am threatened i will pay more exceed the 1.2TB cap, until june of this year it was 800 all of a sudden it is 1000 and sept my internet was out and its over 1200 for Oct.   There are no new devices added to my network recently and have been using the internet same as always. In fact one less user.   I started to monitor my internet data usage with my wifi router and compared it with the xfinity meter. I found the xfinity meter number is shockingly inflated. a live xfinity agent told me I get one month pass.  

This data overage has caused us a lot inconvenience and my family. I hope xfinity can provide a clear explanation and solution.
P.S. We have no need or interest in the unlimited data plan based on our normal use.