Seriously? You actually think that someone with New York license plates sitting in a car next to you would be able to somehow come up with your number to call you?
This is definitely a scam. Said that I would be arrested within 24 hours with 4 legal allegations, due to tax problems. Exactly the same MO as phone number 646-907-9697, which i found on this website. The guy just probably changed phone numbers.
SCAM! Calling you from investigation team of irs. We have just received a notification regarding your tax filing from the headquarters which will get expired in next 24 working hours and once it get expired after that you will be taken under custody by the local cops as there are 4 serious allegation pressed on your name at this moment. We would request you to get back to us so that we can discuss about this case before taking any legal action against you the number to reach us is 6:46 809 9689. I repeat 646 809 9689. Thank you.
646-809-9689 is definitely a scam, and if you're going to use this approach, use proper English. "Which will get expired"... Nope, not going to work... And "taken under custody of the local cops" , er, I was almost filled right there, not.