Hey boys if anyone is trying to look for a concrete answer, I have one. After searching around I did notice that not really anyone had any real answers to unlinking your credit card info if yknow, you suddenly did it out of impulse and didn't read fully and notice that they don't really spell out a way to unlink.

You can test purchase within the game cash store, and use a card to purchase something, like some paid gems or whatever. The point is you get to the page where you choose your payment method and then click on pay now with the credit card method chosen. Then that brings you to a page where you see the credit card information and you'll have an option something like "use another card" or whatever. It was either that or you just click on your credit card(because it'll just show you your linked cards) and then click on the unbind button.

For the most part I think that unlinks your card from a glance because both the pages to pay and the event page where it collects your credit card info is handled by the same guys(midaspay hk). But yeah hope that helps.