If I walked into a brick and mortar retail store that was an authorized dealer for a given product and ...
If I found out that I purchased a defective product after opening it, immediately after I got home, I would expect the retail store to exchange it, same same, with no questions asked.
Is there a reason why an authorized internet retailer should not offer the same service?
edited to add: If the authorized retailer told me to contact the manufacturer I would not be a happy camper.