Weird call regarding Xfinity Firewall

I just received a call and I didn't know the number and was a foreign voice so... I wasn't available (we all do it...lol) I asked to take a message and all the guy said was that he was calling in regards to an issue with my xfinity firewall and promptly hung up. The number didn't have a company name in the caller ID so I'm not sure if this was a scam call?? Or if there really is an issue with my firewall?