I see you were in the US. Did you cross the border via car and switched on the phone in hope that the US add on kicks in?
Probably the phone was still in range of a Canadian tower and used Canada data until you left that range.
The same applies when you returned.
In your usage history you can see the date when data was used.
I lot of customers question the data usage meter. Fact is the meter is legal tender. The discrepancies compared to personal metering is explanable. There are lot of times and situations where data is being consumed and we may not have accounted for it.
@ohlala_PM, when you say gone did you have your phone with you? Weere you out of the country or out of Province or was phone completely turned off?
* I am happy to help, but I am not a Customer Support Agent please do not include any personal info in a message to me. Click HERE to create a trouble ticket through SIMon the Chatbot *