They may say they have the right to send you a refurbished one , but they don't . I can see a brand new one because it was damaged beyond repair , but a refurbished one , no way . I wouldn't stand for it , because you have no idea what your getting . Could have more or different issues then the one you sent in .
I think they have a couple of Tech's refurbishing them & have them ready to swap out to save time , but I wouldn't stand for it , unless they asked specifically if I was OK with it .
I would demand my drone back or a new one , of course if yours was so broken up , you don't mind , but they should still ask .