incorrect information and bad attitude

I went into the Men's Street N1 city branch on Friday 20th February, I wanted to purchase a chain as a gift for someone, before doing so I enquired by the manager Lynne if the chain could be returned for a refund. She assured me if I had the receipt and original packaging that it could be done. I came back the next day before it was the wrong chain and she changed her story completely saying she had not said any such thing. She spoke to me in a very rudely manner in front of everyone.