Daylight *******

Can someone please call me and explain to me why I need to pay extra money to have my ring resized. My husband bought my ring on Friday, 01st May. Today I called the shop wanting to bring it in as it's a little big. I was told that I will need to pay R410 once the ring is back. How on earth does that even make sense. The ring doesn't even have a week and I purchased it at your shop. I really need someone to explain this madness to me.