I cant get my refund

Dear hello peter,today I went to get myself sunglass at Edgard sunglass hub and also to redeem my voucher,the lady told me that to add on my voucher I must pay 800,i give her 400 cash and I used my debit card to swipe another 400.after all that she said she made a mistake I must now give her another 100.i didn't have cash with me,she said she can't swipe my card again.i got irritated with her attitude I told her to reverse the whole thing and refund back my money.she said I can only get my money back after 7working days cause its only their head office that refund.thats their policy,someone tell me what kind of service is that? Now I want Edgard sunglass hub to please refund my money asap,like Now as I want to go by another sunglass somewhere else.it was a night mare dealing with that lady,shes unprofessional, rude and bad.please give me back my money,your policy it's so stupid it only suits you not your customers.can some one from sunglass hub head office attend this asap cause I need my refund!