WHY DO PEOPLE ASK THE DIS FOR LEGAL ADVICE?
Collection agencies BUY the debt from the credit card companies. And they WILL sue if you don't pay. Even for a small amount. They hire counsel who will file literally hundreds of these actions.
know your rights:
http://www.ftc.gov/os/statutes/fdcpa/fdcpact.htm
telling a debtor that he or she will be sued is NOT in violation of the Act.
Pay what you can right now. Continue to call to see if you can work out a deal about what you can't pay. If they file suit, negotiate with their attorney to see how you can settle the law suit.
It takes about 3 years to repair bad credit. Good luck.