Delivered wrong stuff and not apologetic

I bought a queen size duvet set that they were selling and they advertised buy one get one free. The order was delivered without the extra piece for free. I called to ask they said they would send it, the extra piece eventually cam and it was a wrong size it was a 3 quarter. I called to ask why and was told that, that is the way it is because the queen size was out of stock so I should be happy with the 3 quarter. The lady I spoke to told me to give it to a friend or family(this was when I told her that I could not use the 3 quarter and asked if I could return it). Alternatively I should return it and get no refund