Xfinity keeps charging my credit card for a service that I don’t have

I am writing to ask you stop charging my credit card for a service I do not have. In November 2023 I cancelled my contract with you. I changed to spectrum and since then I am using them. However, you keep charging my credit card every month for a service I do not have. I have all the document to prove that I have not been using your service since November 2023. 

You are not authorized to charge my credit card. I have called numerous times to resolve this issue through your customer service. If you believe that I need to pay you send me a detailed bill in mail.