Once I filled in my Candidate's Choice Application to Rensselaer, I almost immediately paid the $70 admissions fee online. This around September. Ok, so actually my father paid it, but the point is it was paid. Rensselaer doesn't think so. My status is still listed as unpaid.
Now when it comes to $70 with a credit card statement to back it up, this sort of thing annoys me. I sent them an (exceedingly polite) e-mail telling them to check their records and update my status, offering to send them a copy of the statement with dates, amount and recipient.
I hope they reply soon. Rensselaer looks like a good school.