I assume you bought from Ebay?
If the tracking number doesn't seem to be genuine, you can always check with the seller which carrier's website you should be checking.
If the item does not arrive, you can open a case for 'item not received' one day after the latest estimated delivery date.
You can find the date by which you should reasonably expect your item by looking at the email you got from Ebay when you paid.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)