The question of a debt being collected after a 1099C is sent is a state specific thing. Some allow it and some don't. In Az. it appears to be case by case. You really need to see a lawyer.
Barski Drake Blog 1099-C
I'd also encourage you to take a look at a federal case.
DBA vs Snow. Debt Buyers Assoc. vs John Snow {former Sec. of the Treasury}.
I can only find PDF links but, here's a snippet from the ruling.
Plaintiff insists that issuance of 1099-C Forms will prohibit Debt Buyers from pursuing debt collection and enforcement activities after such forms are issued, which may be before a state’s statute of limitations for the collection of such debts has expired. However, as stated above, there is no reason that a Debt Buyer cannot include with its statement to an affected debtor an instructional guideline explaining the reasons for the issuance of the 1099-C (for example, because 36 months have transpired without debt collection activity), a disclaimer that a 1099-C must be issued as a result of an identifiable event regardless of whether an actual discharge of indebtedness has occurred on or before the date of such an event, and a notice to the debtor that a Debt Buyer plans to continue debt collection activitie