I happened to create two marketplace modules. One of them was by a mistake and need to be removed.
After uploading module2, I got an email from Sitecore saying it was being reviewed and after 3 weeks it is approved and shows up in discover.
On a suggestion from slack, I emailed
email@example.com requesting to remove module1 but there was no response.
Also, I have updated the screenshot & about section for module2, but it still doesn't show up.
Can anyone please guide me how to contact Marketplace to have my concerns resolved.