The dept has been bought by a collector. They have attempted to serve thus far.
No. You can go to jail in debt-related matters only when you refuse to cooperate with court orders, and even that is VERY rare. We don't have debtor's prison in this country (except for deadbeat dads who don't pay the state-ordered payments concerning their kids.
I'm not your attorney; my answer includes assumptions. If you want me to be your attorney, I'm easy to find.
A civil debt is not a criminal matter.