That wasn't my experience. I ordered a custom with Bax and yes, I had to pay for the custom and the video again, but after printing my invoice and e-mailing it to J, showing them that I purchased it and J knew my e-mail was the one he collaborated with for the Bax custom, he refunded me the money for the video.
So though we order a custom and then pay for a copy of said custom, J will refund the money for the copy back again. Though a bit odd, I got my refund within a day after purchasing it.
Did you e-mail J your invoice? Maybe he couldn't refund you if he doesn't know what transaction it was and what card was charged. Send him a copy (you can generate it off Gumroad) and he'll probably get back to you as soon as possible.