Working from home - order came to home address as ...

Working from home - order came to home address as it should - was not the correct item (I needed more components for it). I called and had to fill out a return survey and order a whole new item and pay for new item. Just received notice the new item is being shipped to the wrong address instead of the home address that the 1st one was sent to. Called PC Nation right away and they said sorry they couldn't do anything about it as FedEx already had it; however, I can purchase another one from them to have it sent to the correct address (which the wrong address was their mistake). I already paid for 2 items and now they want me to pay for a 3rd? I haven't even received the information for the return so I can get the credit for that one!! They made a mistake and will not fix it. Now I have to figure out how to get the item from the wrong address to my home. In the meantime I won't have the item to be more efficient working from home.