Disappointed

I recently ordered some things and they sent me the incorrect color of boots from the ones I ordered. Sent them an email to ask if I can return it at the store they told me yes. Got to the store and they told me I must take something else they can't give me my money back, told them I don't want something else as they made the mistake to send me the wrong order. They then had to call head office and I had to leave because I had another appointment, went back to the store after two days and the lady just told me I had to wait for an email from them for my refund because they can't refund me coz I paid with a card (what nonsense) not like a paid with a credit card or on account. What to do now?