Xfinity is fraud

I purchased a phone for my daughter on the Christmas and activated the one gig data and just four weeks my bill was 347. I called Xfinity and the agent said I used 20 gig whilst I only sign up for one gig data, Xfinity people intentionally don’t want you to see messages on phone whiles your data is getting closed so they always says they sent it to email address (check ya mail ) who on earth is wicked that did that so you wouldn’t know when  you have exhausted ya credit me and my family and friends are all departing from using Xfinity from today this is my number [Edited: "Personal Information"] [Edited: "Solicitation/Inflammatory"]