What is the easiest way to change a credit card to pay monthly bill?

there is a phone number on your bill for Xfinity. Call them and change the credit card with them. Just be sure you get the name of the person to whom you are speaking and note the date you called and the time you called. In these days you can't be too careful. Good luck honey have a good day

I would send an e-mail to the store you've listed above, and explain to them what it is you want to do. I 've used CC's to pay, had no problem. Either that or call the bank whose card you want to use and explain to them.