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Are you required to give anything besides your name, address, and the CA account number as it appears on you CR? Are you supposed to give your SSN? I don't want to give them anything they're not entitled to.
What if they respond with wanting the actual account number,and, and last 4 digits of social? I have one respond with that saying they can not locate my account and need that to proceed with my request. I dont have the actual account number, I gave them what is reporting on my credit report.
Ignore them.
Give them back only as much as they provided in their dunning notice, and nothing more. If you did that in your original DV letter, there is nothing at all to be gained by even responding to them. I would ignore them. Dont even write to tell them you wont provide the requested info.
They are still under the cessation of collection actiity prohibition of FDCPA 809(b) until such time as they validate. It is not your responsibility to assist them in their validation.