worldwide asset purchasing ii llc - do you know anything about the letter?

okay i received this summons for a civil from the court was laeft in my door by a state marshall. i was planning on paying this anyways but the rates got way out of hand. anyways while looking through these documents theres no docket number on this paper work. i looked up online to see if the court had it no where in the system. then three days after i got this summons which says i owe 1,348.84 and was issued a credit card which i wasn't i was issued 300.00 dollars of a payday loan. anyways i recieve this letter from there attorney or collection agency which is Shechtman halperin savage llp, out of rhode island that says that i owe 18432.50 or something liek that and there going to give me 80% off my debt if i pay it by the end of august and it will only cost me 1,348.84 which is the amount that is in the summons.
Can i really trust these people to settle this. plus whats up with this wording of credit card when it was never a credit card to begin with. any advice is welcomed. ps i though if somone is going to sue you that they had to hire a attorney in your state. which i live in Conneticut. thanks all