I had some 900 charges show up on my phone bill 10 or 12 years ago. They had a recording of the person who made the call saying their name and that they were authorized to make the call. The name given and the voice was not mine nor anyone I could recognize. They said they would send an affidavit for me to sign and they would drop the charges. I never got the affidavit but the charges disappeared from my bill the next month.
