cast iron repair ?

just got this message from the seller. seems to be a stand up guy.

I am terribly sorry. It's obvious that iI did not see the crack when I listed them, as my picture is showing the crack and almost 20 yrs /100% with ebay would attest. Again, I am sorry for delaying your project. Would you like to return them both for a full refund ? Or would you be interested (if I have one ) in returning just the one and I send a replacement ?