Billing thru Xfinity for outraged data charges when my data is off on my phone

I need to speak to customer service.  I was promised to get Internet and phone for a program because of low income problems  I qualified because I have medicaid. As t first it was always  26.00 as month. All of a sudden I am still getting charged that amount through Comcast and another charge through Xfinity for crazy data charges that vary monthly from 40 to 90 dollars.   I have called in the past and was told to turn off my data if I wasn't using it.  I do thus and am still getting billed.  I try to speak to a real person but can never get one a d the ai cannot help me.  Can someone please call me.  I am an elderly woman who lives alone , never plays games, or gears music, or downloads on my phone.  I still have my data off and this month I got charged 76.00 thru Xfinity and the 26.00 thru Comcast.  I need help for now I pay more than I use to with another provider.  Xfinity is the one that called me, provided a great phone plan and now it has all changed to a horrible ordeal.