I can't leave just yet. I'm waiting for my Dan certificate. Otherwise it's $400 down the drain, and I'm a college student, it's a lot for me. I don't think he'll give it to me if I leave.
I'm not so sure he'll give it to you if you stay....
In any case, certificates are replaceable, and the rank itself is recorded with the headquarters dojo whether you have the physical piece of paper or not. Don't waste any more of your time with this person.