Credit cards closed or discharged now in collections

I have to credit cards on my credit bureaus that have been closed/discharged....Recently I have been received phone calls from the companies looking for a settlement offer....as far as I knew once they have been closed/discharged I don't have to make any kind of repayment...please advise
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That is a common assumption with no clear answer other than many debts get sold and re reported on credit reports.
Try to stop it here.
Or negotiate and pay a settlment.
Or face the posibility of continued bad credit from this account.