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Sounds like they are asking you to certify that fraud is involved in this account.
Is the issue that you don't know if this is your account because they haven't provided you with anything on it? Could it be your account? Do you think someone stole your identity?
If it is fraud, or identity theft, then you can write your own affidavit (or take the one from FTC) that has the relevant information about this not being your account, that your id was stolen (or whatever). You don't have to use their form.