PaeTec is a telecomm company (like At&T). They may have been responding to a service call placed by a business for which they provide phone service. Usually a T1 or something. It seems they were either given the wrong call back number or it was entered in the system wrong. I would not be concerned.

Received a call yesterday, was told my phone was reported for drop calls.  told woman I had no idea what she was talking about.

Received a call this evening and a man on the other end said "just checking the lines.  This number is for a company in NC and I live in fla.  Have no idea what this is about, just a little curious