CASH ADVANCE AMERICA IS BEING HARRASSED ABOUT A LOAN I DID NOT TAKE OUT. THE COMPANY HAS NO INFORMATION OF THE DATE AND IS DEMANDING 300 DOLLARS OR I WILL GO TO JAIL. THEY HAVE ACCENT FROM SOME FOREIGN PLACE ALSO VERY RUDE. Internet

First of all, there is no such thing as "debtors prison," so threatening you with jail is ridiculous.

Second, if you don't owe the money, tell them "Take me to court, and if you ding my credit for something I don't owe, I'll slap you with a lawsuit so quick it'll make your head spin."  If they keep calling you, get a device that allows you to record your phone calls. 

When they call again, tell them "I am recording this call."  By law, in most states you must tell them they're being recorded.  Usually that'll stop the calls.  If not, while you're recording them, say "you are HARASSING me, and I demand you stop."  If they continue, you can actually sue them for harassment.