If you wanna buy the subs....buy the subs....if you want to try to get your money back try getting your money back.
I believe the enclosure size recommended for the 12's is a .78cf sealed. I'm pretty sure that's after displacement. Like I said...I have the T/S properties at home if you need/want them. It recommends a sealed enclosure but also shows the recommended size for a ported one as well.
While using winISD and entering the parameters it recomends a ported enclosure or a 4th order bandpass. Take that for what it's worth.
Let me know if you want more info.