Lack of transparency/dishonesty

Hi, I’ve been an Xfinity for several years now. I started with their mobile service in March this year, also buying iPhone 17 pro max with their package. Xfinity withheld vital information from me at the time of my purchase and I would like to dispute this or take it as far as filing a lawsuit for lack of transparency/withholding of vital information/dishonesty/incompetent customer agents/lying.