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If Chase is refusing the PFD and MRS is not reporting then I would just pay it off. Chase is going to affect your utilization until it is paid. Also, if you poke the bear you may end up with a Chase account showing $0 and a CA being reported.
A creditor can, if they assign collection authority to a debt collector to collect on the debt, still be the owner, and yet decline to take payment.
One reason they hire a debt collector is to remove dealing with the consumer.
My speculation, if the creditor is still reporting a balance and has been informed by the debt collector of the payments made, is that the debt collector does NOT own the debt, but rather only is an assigned debt collector.
You can make a pay for NOT reporting offer to the debt collector, thus ensuring that they will not report their collection.