How can I remove my credit card from the new ads manager site

I recently checked out the new Roblox Ads site manager and had my card added to it, not knowing they will be charging me 100 USD every month for something I probably will not be using. Can someone explain this to me and how to remove my credit card?

Uhhh try replacing it with a fake card? Unless that’s against Roblox tos. Not being clear with how to remove your card is probably illegal.