Is the seller in China?
Open an Item Not As Described dispute immediately. The 'replacement' will never arrive.
In addition, if the seller is not in Canada there is no easy way to send you a useable * return shipping coupon.
*There is a thing called an International Reply Coupon. You take it to your PO and watch the clerk be completely baffled by it. In theory it can be exchanged for postage. In real life, no easy.
Wait a minute. The seller really did send a replacement? And it is what you wanted?
Wow.
I never believed in miracles before.
Just send the wrong item back. You don't need Confirmation of Delivery since your seller acted above and beyond. She might even refund the postage when she knows what it is.
Use Paypal shipping, there is a 5% to 18% discount from PO counter prices if you buy labels through them.