Bad to do business with

In November 2015 I puchased a whatch online from Matt Arend. I did it on their website. When the watch was delivered which I have to wait a while for, it was the wrong whatch. When I informed them they told me I ordered the wrong one. Which cant be possible if you order it on their website where you directly choose the product from. My boyfriend then said we should keep this one and buy another one for his son's birthday. He did not wear the watch at first because he said it was too nice. The second time he wore it to work it started to form damp. When we contacted them they told us we need to send it back at our own expenses. How can we do this as we already get no feedback from them or do they answer their phones? We will send back the watch and then we hear from them never again. I need my money back.