I have a capped account with WA and noticed that a few days ago - according to the logs they provide that 4 gigs was DL between 11:00 and 12:00. As I have a 6 meg line, my max DL is about 2.2. gigs per hour
Anyway I did post this on the WA forum and had no response as well as take it up with support. After chasing support a few times I was given an answer that "all ISP's use this system"; "part of the bandwidth could have been allocated to the 1/2 before" (interestingly enough from 10:00 to 11:00 my dl was 2 gigs so close to the max).
At the end of the day I have been told all is in order and systems are fine, so no problem, even though this has happened twice this month
For me 2 gigs is not end of the world stuff and now that there are problems with international connectivity I would not be able to use the bandwidth anyway. My issue is the principle. Capped user pay for a certain allocation of bandwidth and should be able to use it all if they so choose. If the system is in anyway not recording something correctly, then the service provider should take the fall, not the customer.
For uncapped users this is not an issue (except I guess with WA and rolling windows); for capped users it is an issue of principle as we are not getting all we pay for.