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I'm a bit lost here. Can you provide some more information? What is bootcamp fitness and how does it work? It sounds like a gym membership. Were you supposed to pay a bill and never did? What was the amount, was it supposed to be paid all at once, over time, or what? Did you just ignore the bill(s)? What's the $5/mo? That's pretty cheap if it's a gym membership. Are you still in the first year or has that ended?
Once a debt collector makes an initial communication with the consumer, that triggers their requirement to then send dunning notice within 5 days. If a debt collector is out there, you did not make a mistake by taking their call. You initiated their requirment to send dunning notice, and also now permits you to send an immediate DV request.
You can send a timely DV once you know that a debt collector has collection authority.
A timely DV imposes an cease collection bar, which remains in effect until they have send validation.
A DV is timely if sent either prior to dunning notice, or within 30 days after they have provided dunning notice.
I would send an immediate DV in order to impose a temp cease collection bar.