Hi there. My name is***** will be my pleasure to assist you with this. May I ask specifically which Google service your credit card is tied to? IS it for the Google Play store or for Google Ads, or for something else?
If it is not tied to an active Google Ads account, the following instructions shoudl allow you to remove it.
If that works for you, please kindly take a moment to rate my service. You can provide a rating by clicking on the stars and then clicking on submit. Please don't rate until you are satisfied. If that doesn't work and you need more help, please allow me to continue to work with you or allow me to "opt-out" so that other experts can assist you. Your complete satisfaction is my goal! Thank you!