No, I already promised them I would remove the flags so I better stick to my promises.
Well, you can't

It literally said so when you created the Flags: "Flags cannot be deleted!".
You can withdraw your Support, but that doesn't mean the Flag becomes inactive.
You may want to read up on
Trust flags:
Creating or supporting a scammer flag is actively affirming a set of pretty clear fact-statements.
Okay well then I will just withdraw my support and add a text to it that it has been resolved or something.