Complaint Review: Personal Cash Advanvr

 I was contacted May 5, 2017 by a civil document company and they gave me a case number and a phone number. Phone number was 1-855-533-8920 and andwer was MMG LEGAL which by my research doesnt exist but there is an MMG LAW FIRM based in Texas so thats my first red flag. (Deleware company with no business license on file being represented from law firm in Texas) i called the 1-855 number they asked for my case number had all my info on file and claimed they represented Personal Cash Advance loans which from my research isnt a loan company but a loan lender finding company. They claimed i took a loan out in 2013 for $370 and that they would settle out of court for $370 or i could let it go to court and they would persue $1,700 in court. I was scared. I called the company but no phone numbers i found are functional and division of revenue reports no business license on file for this company and Better business bureau gives company bad report also found multiple complaints like mine on thus company. They claimed to have sent me letters in the mail but i never recieved them. And they also claim ill be served a subpoena by officer sometime today or tomorrow. Id like opinions or other similar experiences so i can compare to forsee the outcome of this scenario. Please help