H1B DropBox status -Refused 2021 Hyderabad

Hi -
I have dropped all required H1B documents as per dropbox appointment on 7th Jan 2021 at Hyderabad Dropbox location. On 14/01/2021 visa application status was changed to “Refused” from Application received. As of now I have received any email from VAC.

  • What is this status means?
  • Incase If they have asked me to appear for interview by issuing the 221G, then Do I need to take appointment for Visa Interview or I can walk in any business day for interview ?