Chargebacks seem to be appropriate when you truly no longer want to do any future business at all with a particular company - it might not be limited to just "G suite" or "GCP", or "AWS" or "Amazon", but the whole conglomeration.
Obviously YMMV, I'm sure people have had divergent experiences with this. I've always personally been able to get things resolved eventually through chat/email/phone, but I trust that not everyone has the same luck I do.
Was I willing to cut off the New York Times like this when all other means of canceling my subscription failed? Sure! Result: powerful, but not in need of breaking up.
Would I be willing to do this with YouTube, for fear of what it might do to my Gmail account, a service that is seemingly completely unrelated? Good God no, which is one reason I never signed up for a subscription. Result: absolutely needs to be broken up.
Just don't try to use that card number to sign up for any other Google product.
On the other hand, that charge might just be the outstanding balance when you cancelled, so it might be legit.