How long would you wait before going to your credit card company? I have been told my order has shipped twice but never have received a tracking number. Just excuses. card took a hit the day the order was placed a month ago Monday. It doesn't take 5 minutes to provide a tracking number if they actually shipped item. If you are truthful from the beginning I understand. No this isn't Curtis. My order from him came in a timely manner. If not received by Monday I will disclose the culprit after talking to my credit card company.
A month, no tracking number & no delivery? Without a very reasonable excuse (even the cheapest Retail USPS provides a tracking number), one month would be about my limit.
I've had to cancel once with Firefox for a chems order--very similar story (Visa), once with a Chinese scammer for some remote control gadgetry (Paypal refund), and twice, years apart (Visa again), with the only two car rentals I ever booked in South Africa--Budget tried to bill me a grand (!) for "damages" but I had both pics and video of the return (I'd learned) and a smaller agent tried to sneak bs charges through several months in a row thinking I wouldn't notice.
It's easy. Better if you have e-comms, but not necessary. Call your CC company and tell them that you ordered over a month ago, nothing's arrived, the vendor will not provide evidence of shipping, and that you've tried to resolve this in good faith. They will technically put a "hold" on the charges while they do an "investigation", which will inevitably be found in your favor and the charges removed. You won't owe anything in the meantime. Every time, though, Visa has indicated that I will no longer be able to use that particular card to make purchases from company in dispute. No problem, never planned to. Once call. 10 minutes. Problem solved. I've never been asked to provide copies of email correspondence etc., though they might ask for it.
IF by some oddity, the package somehow does find its way to you eventually, and you are convinced that the vendor actually wasn't shady (beyond negligence in not sending tracking info) then you'll need to tap your conscience to decide what's next.
A month with no tracking + apparent excuses + no product=no confidence in vendor and a cancelled transaction.