DC Capital

Has anyone recently dealt with the agency DC Capital, and how can I find out if they are licensed in the State of PA to collect on a very old pay-day loan? The loan was for $400 back in December 2007, apparently fees have increased it to $640, and I am being told they are going to place a civil and criminal lawsuit against me. After several harassing phone calls, and 1 last call from someone impersonating an "investigator", I freaked out and made a payment of $300. I then learned a few days later from the internet postings that this company is most likely a scam and/or a junk collection group. I am disputing the payment wih my bank, but given that the payment was made on a debit Mastercard, I wil most likely not see that money ever again. Anyone have any suggestions? I also called the company asking for the license number and mailing address, neither of which they were willing to give me. Has anyone else had a problem with this company? If so, what was your outcome? I have also filed a dispute with the BBB of Greater NY.