He is almost certainly a woma. There are a lot of similarities between the woma and spider genes but spiders always (at least in my experience) have a funky head pattern, which yours lacks. They also tend to have a lot more white speckling coming up from the belly, which yours (again) lacks.
I honestly dont don't think you got cheated at all. If he's a normal he's the most reduced, funkiest patterned "normal" I've ever seen. And personally I think a woma is worth more than a spider simply because of the market being flooded with spider morphs-- if you're worried about being scammed.
Also, in regards to the verbage "fancy"-- I've personally never, in all my trips to the pet store for whatever reason, EVER seen a normal ball Python being sold as a fancy. Maybe my local stores are better at differentiating, idk. Not saying that it never happens, because believe me I'm sure there are employees out there that couldn't tell the difference between a normal and a spider/pastel/whatever, just saying I've never seen it. BUT, like others have said, just because it's labelled a fancy doesn't mean there's any law obligating them to sell only morph ball pythons as fancy.