Deceptive promotion and billing practices

I intend to file a lawsuit against Xfinity mobile for deceptive promotion and billing practices as well as misrepresentation and breach of privacy. The customer service to resolve my issues over the entire time I have been a customer has been useless and highlights how fraudulent this company is. I was promised a trade in cell phone for no cost but have been billed for the phone despite assurances from numerous agents that I would get a credit for the device. My bill is never consistent t and goes up for no reason. Now Xfinity is telling me I don’t even have a mobile account with them. To top it off Xfinity shared my personal account data breaching my privacy. Every time I call to speak to an agent, they cannot or will not resolve the issue and disconnect the call instead.