1 year promotion free unlimited phone bill but I got denied after switiching

I had/have the worst experience with xfinity. After getting emails for the one year promotion of unlimited 1 year mobile if I switch to xfinity, they said I can only get approved if I upgrade my internet to certain speed. The ad was so misleading and not all the info included. If this problem does not get resolved I will writ to FCC, and move my entire account to another provider all together.