Ace Cash Services Cash Net USA, Cash America, 500 Cash Advance said will issue a warrant if I don't PAY Internet

This company tried emailing me towards the beginning of March 2015, provided a case # and said I took out a $300 loan, and never paid it back. I asked them to provide me the alleged date of this loan so I could check my records. I have never received a cash loan over the internet. In addition to their threats of prosecution for fraud, etc they have just in the last 48 hours threatened to have a warrant issued for my arrest. I have demanded the loan companies name, date, etc and was just told today that information is private! My bank account that this loan was supposedly deposited into has been closed for almost a year, on top of the fact that I applied for loans online but never followed through. I am not paying s**t especially when they won't provide any information except a balance owed of $825.86, that's the $300.00 for supposed loan amount plus additional fees and charges. No way.