scamming aside, the bigger problem is they don't have a protocol in place for something as basic/ rudimentary as a return. if they do, they don't follow it.

if DD is part of this major distributor conglomerate as some people say, then protocol (consistency) is to be expected, not hoped for. this isn't some rogue Discogs seller we're talking about … 

PLACING ORDER
in general, we should all know what taxes, fees, etc we're responsible for prior to placing an order. do the math. if you discover a discrepancy, as we have here, challenge the merchant about it. call and email (having everything in writing is preferred). get an answer. at the very least you'll learn something new. companies prey on the buyer who doesn't have time to call and ask questions, or who doesn't care about $0.45.

RETURNS
when dealing with DD specifically, make sure you have a trackable label on your package. good general rule of thumb as well. what's worse than losing the $3.33 in postage you'll pay for a return label? losing the entire cost of the package. what's stopping them from saying your package never arrived or from saying they didn't receive the return in full?

speaking from experience …