Clickbank.com — also called Clickearners.com review: Having trouble logging into my clickbank account

I thought my Yahoo address is my user name but customer service won't give me a straight answer. I also don't remember my password but customer service wouldn't help me with that either.
If necessary, I just like to get a refund but I need to log in to do that too.
I heard that I have until Jan. 26 to get a refund. Could you please hurry?
(I originally registered Nov. 30 last year but I haven't gotten any cooperation.)