I was charged twice for my Now mobile plan

Hi this is sam I am now mobile customer From last year this month suddenly I got charged Twice on my debit card, I have no idea why I was contacting all the Xfinity numbers as well as the no mobile numbers which indeed gets redirected to Xfinity or Comcast or sometimes they just send you the Xfinity assistant chat bot link and was talking to more than 10 live agents in the chat bot and no resolution and no refund at all for my payment. Can anyone help me to reach out to Xfinity customer care or provide any number to contact them. Thank you.