The Canadian postal dispute has only just been settled, so I'm guessing there will be quite a backlog in the system.
Maybe the seller can't tell you it's been sent if he can't actually send it.
It's too soon to start a claim, you have to allow a reasonable amount of time for the item to arrive. I don't know about the Canadian postal service, but stuff from the US often arrives here in France faster than stuff sent from the UK.
And, yep, some sellers are very uncommunicative, but 99.9% of them are genuine. Especially, I find, the Chinese
I've only had one problem in the past dozen or so purchases, and that was a UK seller with a top reputation who sent me a counterfeit item (it was only £8.00, so when he tried to give me a refund to say it wasn't a counterfeit, I figured it was £8.00 well spent to leave the comment on his feedback).
So I'd say, chill and see what arrives in 10 days or so. If nothing, then think about starting a dispute procedure.