More and more people are ignorant of return/exchange policies at various stores. Many stores policies on electronics are similar: 14 days with original receipt and original packaging for full refund. Some charge a 15% restock fee (Best Buy) no matter what, while some (Office Depot) only charge it if something is missing from the box (UPC, cable, discs, etc).
Blaming a Target Associate for selling the wrong item is, well, stupid. Unlike a company that specializes in the items you bought, Target is a department store like Wal-Mart where the associates do not get trained to sell the items, or to suggest the correct accessories. What knowledge they may have is limited to their own use, unless they are a tech geek who looks stuff up. Customers need to research on their own before they go fussing about "not getting the right accessory" at Target.
Again, blaming a Target associate is ridiculous. It is like blaming a McDonald's employee because they don't "Flame Broil" their food like Burger King.