My transaction got stuck on sent for a very long time (more than 3 hours). How should I proceed?

My transaction got stuck on sent for a very long time (more than 3 hours). How should I proceed?

When B3 is submitted, wait for atleast 3hrs as it might got stuck only with customs, after that, you can contact GeTS to reverse status to DR for you to resubmit it. If still get stuck for another 3hrs, call CBSA to check if they have issue or if they can see it already.