Free mobile plan for one year with internet - false advertising?

I signed up for a mobile line because Xfinity kept sending messages urging me to activate a free line, since my internet plan qualifies for the promotion. However, from day one the promotion has never worked correctly. Every month I have to call in, fight through the AI system, deal with agents who can’t resolve the issue, and hope to find someone who can manually apply the $30 credit. I’m spending hours each month just to receive a credit that was supposed to be automatic. One agent even told me that if I want the “free line,” I must call every month to get the credit added. At this point, it feels like false advertising. Also, the charges went up to $41.