Sorry to hear you got dicked around by the shop….same thing happened to me last September.
Bought a new Orange 5 with X2 brakes, off to the Alps for a week so went to my LBS and asked for 3 pairs of pads for each of our bikes, owner says you'll need 6 pairs of the same as X2 pads are no different to the Mono Mini's on my wifes bike. Lucky we didn't need any pads for our trip because as it turns out they wouldn't have fitted mine anyway.
When i mentioned this to my LBS after the holiday he said "Yeah, they're different"!!! I don't use him anymore! I was so annoyed with him, he'd been great up until then too.
So, do your own research is the moto of the story.