Stay away from settlement. Those companies will get you sued. Better not to pay and clean up your credit.
You can't just call and negotiate. They won't even talk to you until the account is charged off. I suggest going through 3 collection agents internal (until you get the Sr reps involved who have authority) or 2 collection agencies.
Make sure you mark all correspondence as an offer to compromise NOT an offer to pay, bring an account current or renew an alleged indebtedness.
Jon
The preceding is not legal advice, is not from a licensed debt counselor, and is not provided to persons from states which providing such information requires a license.