Data usage overage not correct

Since November I have been double my normal usage. I have worked from home for 2 years and NEVER had this issue. I cannot find any source as our technology has not changed. There has to be something wrong with Xfinity but the tools provided to look at the devices does NOT allow you to see what is using the most data. You also cannot speak to a human ever so I am almost to the point where I can cancel service online and go elsewhere. Anyone else have this issue with a Comcast router at home?