spam call filtering problems

My friend both have Xfinity phone service for our land lines.  I've been calling her for years with no issues.  Over the past two or three months whenever I call her I get a message that her number is protected by Spam Call Filtering.  The recording tells me to enter a two digit code, but when I do, the phone rings about ten times and I get another recording asking me for a remote access code.  She swears that I am the only one this happening with and that she has not ordered Spam Call Filtering for her home phone.  What is going on?