Customer Service / Xfinity Mobile

I recently signed up for Xfinity mobile because your representative told me I would get a $75 discount on my cable bill, for adding a mobile phone which costs $25/month.  Made sense to me - the math worked.  My next bill arrived and I got a $10 discount.  I have spent the entire morning (3 hours) on the phone/ text message with multiple representatives to discover that there is no such promotion.  I am disappointed that your representatives are under such pressure to sign up mobile customers that they mislead your customers.  So I have cancelled my mobile service and am returning your cell phone.  This is aggravating and time consuming, but unfortunately, typical of your customer service.