Welcome to the Community!
Canada Wide Directory Assistance/ Canadian telephone directory is a paid service.
A charge of $4.25 is applied when you contact 411 to request for an address or a phone number.
Is it possible you dialed the number or borrowed your phone to someone who did?
The usage is normally detected through the SIM card in your device. We can always take a look at it with you. You can contact us or we can send your a PM here.
Let me know what you decide.