There is information that you need to be aware.
1. The usage meter does not operate in real time.
2. The delay is not known and posts here seem to suggest that the update is erratic.
3. The subscriber usage may not be updated on the weekend.
4. The usage meter that Bell uses is in all probability not the one used to bill customers.
If you feel that you have a case against Bell and its usage calculation, I would suggest that you post in the Bell Direct Forum here:
»Bell Canada Direct