Cancel Netflix and Refund Mobile

I have been an Xfinity customer for multiple decades and the only thing I have learned is that they will go to great lengths to scam me. I have been charged for Netflix that I have never used and every time I request to cancel in person, through the chat assistant or by phone I am told to contact xfinity support, but that seems to be impossible. Years now I have paid for a service I do not use. I was also sent a mobile phone that I immediately sent back and am still being charged monthly for services yet when I try to remove my payment method it says I can't because it is set up for autopayment for mobile but when I click to manage mobile account it says I don't have one. Seems to me this system is purposely set up to loop to see just how long it can take customers money. Not to mention take advantage of the elderly or those less technically inclined. I would like my money back for the services not provided or used.