Possible Xfinity Scam

I've been getting phone calls from someone claiming to be from Xfinity they said I have a security issue with my internet modem. The said foreign Ips are logging into my modem.

He didn't even know I'm not using an Xfinity modem. He said he was going to disconnect my modem and wanted me to log into my account. When I confronted him about not knowing which modem I had had he hung up' The call appeared to be fro an Xfinity 800 number, Anyone else have this happen?