The caller (an American male, no noticeable accent/dialect, no background noises during the call, no audible static - very clear connection, estimate caller is late 20's to early 30's in age) claimed to be calling from Comcast and stated a first/last name and asked if it was me.  Please note that 720-463-5465 is a private landline based in Sedalia, Colorado and is not an authorized Comcast provider number, and the caller is not a real Comcast employee (verified by myself with corporate).  I refused to confirm or share any personal information with the caller.  The caller then stated that he knew that I was a Comcast customer, a first/last name, and again asked if I was with Comcast and if my name was first/last name.  I again refused to confirm or provide any personal information.  He then said "thank you for your time" and hung up. The two red flags for me were that the Caller ID description did not say Comcast or have their logo.  The second is that I received the call on a non-Comcast mobile number.  I do have a Comcast landline in my name - if they were ever trying to reach me, it would be using the Comcast landline. After confirming the 720-463-5465 number is not affiliated with Comcast, and that the caller is not an employee, I filed an online federal complaint with the FTC and would encourage others to do the same.