I have this same issue! My monthly bill is $29. I was charged each month to my credit card for $29 each. But in Dec and Jan was also charged $267 and $536!! OMG. I contacted comcast earlier today and they find no record of these large charges.
Hello riley1231. I can assist with reviewing your account for the December and January charges. If the charges are fraudulent, I can help point you in the right direction for proper support. Please send me a private message and include your full name, service address, and account number so I can access your account.