I ordered a pair of boots from Spain, so on top of the cost of the boots and the shipping, I also had to pay just short of £60 customs tax. The company have sent me the wrong size boots. I've been back and double checked I didn't order the wrong size, they've sent me a 6 when I ordered a 5. Am I right in thinking that because it's their error, it's on them to put right? Not on me to pay to send them back to Spain, and then pay another lot of customs tax when they send the correct pair? AIBU in thinking this is their mistake to correct?