If you are asking whether the lender's writing off the debt in 2010 prevents them from later collecting the debt, no it does not - but they will have to report the associated taxable events. (We had a bit of a discussion of this issue a few months back.)
Odds are this is a junk debt buyer. Also, there is a possibility that the statute of limitations has run. But to comment on any of that you would need to share some details.

