Same issue, some lady named Valerie saying it would be very beneficial for me to contact her regarding a federal tax withholding. So relived to find this page and know it was a scam. Happened to my cousin 3 months ago and she almost sent someone 3k before she realized what was going on.
WCSA subscribers is what the recording told me when I called them back. Stating I won some money and they got my number from something i subscribed to..... SCAM!