brand wants to adjust price after order?

hi all!

i recently placed on order on a jewelry website (small designer i have purchased from before). they had a sale and i found a 14k yellow gold and amethyst ring listed for $86, it seemed like a great deal so i snapped it up as soon as i saw it. it did seem low but not unusually so considering they listed it as a sample.

wondering what you all would do in this situation? my initial gut feeling is that it feels unfair that they want me to pay more because they listed it wrong?

but i don’t know-just wanted to get some additional eyes on this to see what you all think because i could absolutely be reading this situation wrong?