Comcast Data Usage

So what is the deal with the network data usage meter on customer.comcast.com? Last month I was trying to get the end of month surge to use up the last of my allowed quota. I hopped on like the 29th and it was already to a new month. I checked my billing date and it was the 28th so it appeared it all got reset. However this month I plan for the billing date which starts on the 29th and today I am still racking up data for October! How can I stay under if it’s not predictable. So now…