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You can send them a DV but if it isn't timely they do not have to respond.
Are they updating monthly with the CRAs or has it been dormant for awhile?
Yes, it would appear Asset bought the debt.
Once it is off your report there is nothing to do a PFD for. You could just pay them without worry.
I would just let it be excluded before paying. It is only 5 - 6 months away. Maybe earlier depending on the CRA.
After that I would offer something that leaves you room for negotiations. If they want money, they'll accept a settlement.