We recently bought an expensive bracket to wall mount a new TV. We bought both items from the same online shop. The bracket doesn't fit so we need to return it. The seller (via chat as you can't ring them - surprise, surprise) is saying we need to pay to return the item. It's a large bracket so returning it would not be cheap. Is that correct? Even though the website recommended the wrong bracket so it wasn't our mistake? I have tried to look online at consumer rights for this scenario but cannot find anything. Thank you.