I realize you're upset, but it seems you didn't understand what you ordered (not saying the page was clear, as I've seen kits advertised by their total capacity without clear mention that it uses multiple sticks to reach the stated capacity, such as 8GB, and not clarify that 8GB = 2 * 4GB sticks).
So it's in your best interest to check things out further (price would have been a clue if you knew what it actually goes for), such as copying down the manufacturer's P/N, and search their site directly (even Patriot's site wasn't that clear - biggest clue was the image of 2x sticks, while it was made clear by some resellers that popped up when I searched the P/N I read off of the pic you shot of the memory).
One of those "Live and learn" situations...
For memory, I'd suggest
OWC, as their site is easy to navigate, and they specialize in Macs. So what you order will work in your system. Prices are decent as well (others have found better pricing from time to time, but to be successful, you really need to understand the details). So the convenience is worth a couple of dollars IMO to eliminate the aggravation and cost if you end up with the wrong stuff and have to pay the return shipping, and possibly a restocking fee.