I received 3 calls from this number today at work. My caller ID said Philadelphia on 2 of the calls and the other one was from Botswana. It's totally a scam and I just blocked this number!!
It is a scam!!!! Just hang up, believe me, they are phishing for information and scamming for money. You can report this call on the ftc scam alert site. Https://www.Consumer.Ftc.Gov/scam-alerts or just google irs scam phone calls. Put yourself on the do not call list also to help avoid this crap.