Daily data usage

I want to know where I can see how much data I've used each day in the current billing period.

I don't want to know the total. I know that. I want daily information so I can see why my data usage is so much higher this month than any other month in the last 5+ years.

I chatted with a rep who copied and pasted information about the Xfinity app that was not helpful at all and when I asked again where I could get this information, he said he didn't have it. I asked him who does have this information and how can I get it.  He then said "let me check." That was about 30 minutes ago and though I have asked him if he still there, there is no response. He is obviously not.