Cannot make credit cards inactive

I’m writing today to report a bug. The chat support refused to believe this was a bug.

https://cl.ly/2y2z3K0S2n0V

We are unable to deactivate credit cards.

We have cleared our cache/cookies, tried multiple browsers, and even tried a PC that has never accessed your site before. The results are the same.

How can I officially report this? We’re VERY concerned about the wrong cards being charged as we cannot make them inactive.