Do NOT pay these people, there is really NOTHING they can do. Oh sure they will promise to take you to court, they will continue to call etc.... Just hang up on them.
If you do not have the money and you honestly can not afford to pay. DO NOT PAY THEM!
DO NOT make payment arrangements unless they send you written confirmation that they agreed to such FIRST. Make sure you get it in writting first!! No agreement in writting NO Pay!
This group is of the lowest form of collection companies
You will NOT go to jail, you do not need to worry.