I've bought a pair of shoes for my 3y kid and after trying them on again out of the shop, realized…read morethat they have a bit strange form, too narrow. So I've asked to return the money in the shop, returning perfectly new shoes, never worn, etc, and they rejected, with no easy, they say that they don't return money.
Giving them 2 starts, because they gave me a "gift card" on the same amount, but "activation" of that gift card costed more than 10% of the shoe cost.
They are not enforced by a law to return money in that case, but anyway it's not a good service, most of good shops would just return the money in my experience.