Fraudulent charges on Amex

I have my autopay for my xfinity mobile on my Amex card. Yesterday I got my latest Amex statement and it showed I was charged for my monthly usage on April 4. And then starting on April 22, I was charged $99 a day everyday through May 3. The phone number next to these fraudulent charges is the actual Xfinity customer service number. When I called I was told xfinity did not make these charges. There was no concern on Xfinity’s part that whoever was making these charges was using Xfinity’s official contact information. I have contacted Amex and started a fraud report. I tried to remove my Amex card as my autopay but was unable to.