Is this something you bought during the sale? Final sale items can only be exchanged, not returned so that could be a reason you see this.
Thanks for your reply. Yes, I bought items when they were on regular sale. Now all of the items are on 'final sale' but they weren't when I placed my order in early January. They only just arrived so that may have something to do with it, not sure. The website says within 30 days since purchase and I am still within that window.