payday scam

I have been getting calls from different men with very strong indian accents, they say they are from some legal department and that there is a lawsuit against me with some very serious charges, such as theft fraud, and so on and that I could be facing jailtime. these people dont want to give any info you ask them, they tell you a case number and that they want to help you. they then tell you that you have a certain amount of time to give them a certain amount of money either by money gram or credit card. when I asked who was filing the charges they said cashnet. then they gave me a number for cash net that was bogus! they then tell you to pay a smaller amount and that it is from a payday loan that you recieved. I didnt give them any money and noone else should either! they will not give you proof of the charges. they told me that after I pay the would provide me with verification.I have done research on this and even called the police! they give me names such as Andy Taylor, Robin Williams, Arnold Whatson, and they even called my sister and said the name was Jimmy Carter. report this crime and dont give any info. Has anyone else recieved calls from these people? one tim they said they were from united paralegal...