I too would contact amazon about returning it before I did anything else.
they have options for online chat or they will call you.... find the button to contact amazon.
then if they will not accept the return, I agree....swap the end(s) to what you need.
To answer your question though, I think those twist locks are most often used in marine applications....and industrial
but, I'd bet that even though you missed the return window, amazon will work with you, especially if the cord has not been used....