Scam Voicemail Message from "Xfinity" calling from [Edited]

Hi.  This afternoon I received a voicemail message from a caller at [Edited: "Personal Information"].  The message said it was Xfinity calling to warn me that my bill was about to go UP by 50% if I didn't call them back.  It sounded like it was using the same computer generated voice that Xfinity actually uses.  I logged into our account online, and confirmed there's no notice about any billing increase.  So I called the number back out of curiosity.  The scammers did a great job of imitating Xfinity...same hold music, same voice.  I hit zero, and got a guy without any discernable accent (at first).  I said I was calling because I'd received a weird call.  He then asked was is a call or a voicemail.  I confirmed it was a voicemail, and it told me my bill was going to go up by 50%.  He asked me who I am, and I said I'm just calling to figure out if it's a scam.  LOL...he becomes belligerent and asks me if I'm a scammer.  I said "No, I'm trying to figure out if I got a call from a scammer."  So then the becomes more belligerent and acquires and accent (India? Pakistan?) and starts asking me how I'd feel if I were called a scammer.  I said let me talk to your security dept.  He said "Sure," then disconnects me.  So...heads up everyone.  If you get a call from [Edited: "Personal Information"] (NJ number) purporting to be Xfinity, it's not.