Linux: monitor my own internet usage page by page

I have a monthly broadband subscription which rolls over on the 23rd of each month. I had arrived near the end of my usage so I was carefully checking that I didn't go over my limit - they crucify you for excess usage!

So, when my usage didn't roll over on the 23rd, I rang them to check what was up (turned out that it was due to their end-user web interface not being entirely not up to date - they're quick enough to bill though!).

Now to the question - the agent told me that I had used 2.5MB (or similar figures) PER PAGE just to check my usage (the only pages I had accessed on the two days in question). To say I was shocked is an understatement. These are not fancy pages - v. little graphics &c.

So, now I want to check up my internet usage (per page). Can anyone point me to useful Linux tools in this domain? I have Googled but have found that everything is either Windows and/or doesn't give results by page. I don't want something that works in real time, but rather keeps a record, preferably something I can put in a database or at least a spreadsheet.

This is not a shopping list question - I just want tool names - not "but blah1 is better than blah2..." type debates (I can research this myself). I did consider Softwarerecs.SE but believe that it's more appropriate to this forum. If a moderater thinks different, then my apologies and I would be grateful if the post could be redirected.