If you send your DV within 30 days of their collection (dunning) notice, you will impose a cease collection bar on them until such time as they provide the requested debt verification. I presume they have already reported their collection, so a DV at this time would not affect their prior reporting.
If you either want their statement of debt verification or want them to cease collection activiities until they verify, then send a DV.
A DV might result in review of their next step that otherwise may have remainded dormant, such as initiating legal action, so it has potential drawbacks.
Additionally, if they choose not to respond to your DV, and simply defer further collection activity, the continued cease collection bar will also preclude any PFD negotiations should you later decide to offer payment and they have not yet verified.
What is your primary purpose for sending a DV?
