Scam call?

I have a technician coming out this afternoon, and about an hour ago, I received a call from [Edited: "Personal Information"]. I missed the call, but the voicemail said that it was someone calling from the “Xfinity Advanced Technical Support Team” about my scheduled appointment. Since I couldn’t find this number on Xfinity’s website, I didn’t want to call it back in case it was a scam.

Is this a legit number Xfinity uses?