my mother received the same message from "Revenue Canada" and called to answer to a "mr. adam spencer" (his assistants are "ray" and "anna"). he told my mom to send a money order of 7500 dollars through walmart or a western union (which is very sketchy) or she would be arrested. he told her not to tell anyone, and if the bank asks why you need the money to say its a family emergency. it seems that their new number is 1(343) 885 7631(which is the ottawa area code). they are very convincing and will even give you id numbers, rankings, and an office location. we went to the police and there have even been reports of these people threatening to deport immigrants (who dont know any better) if they dont pay right away. i hope this helps.
Caller with a foreign (maybe Indian accent) left message saying he was with the US treasury and I must call back. He said that this was an enforcement action and failure to follow up would be criminal and I would have to appear before the magistrate's court. Message said to call 415-234-0459, but call came from 818-230-1471.
I just spoke to a guy with an Indian accent claiming his name is Adam Spencer. He also claimed his Revenue Canada ID number is 22815421. I asked him how come Revenue Canada has a number with a California area code, and he tried to convince me that many Canadian Federal departments use phone numbers in that area code. He was focused on convincing me to share my phone number and other details so that he could tell me what the reason for the call was. When I accused him of running a scam, he mentioned me getting a lawyer. When I said I didn't need one and Revenue Canada could send me a letter by mail like they usually do, he hung up.