Xfinity makes deals then charge different amount! That's fraud...be careful

In August 2024 I called Xfinity to request internet services. They offered a deal, and I accepted. Few days later nightmare started as I agreed to get the internet modem from a store to avoid pay shipping fees also because store was by my house. In the contact I claimed reimbursement of that shipping fees and was proposed a new deal of internet 800 Mb and 1 iPad for the total amount of 50 USD. I checked and rechecked the amount was not one time, there was no hidden fees, and it would be for 24 months. Asked several times to the agent and she confirmed. I signed the agreement digitally and 3 months later Xfinity is charging me $60 for internet and 29,38 USD for the mobile service (iPad). I've been calling, using chat on Xfinity portal and also went to the store weekly to have this solved and they just push me from agent to agent but don't solve.
When I was at the store on November 23rd, I open a ticket ECM0010768216 that had told me it would finally solve o late end of November and today December 14th still not.
Regarding this each of you can build own opinion but for me when to parts agree something and one doesn't accomplish that's fraud. I would like someone to explain me how to complain to any State or Federal consumer rights association about Xfinity services as they can't be playing aggressive marketing to get clients and then step back with their word.