Hello, I applied for a US B1/B2 visa and went for and interview the 28th of March. The CO said my visa is approved and gave me an approval slip with instructions on how I would get my passport delivered via courier service in one week. When I checked the CEAC website's tracking, it says the visa is Refused (check attached picture) immediately after interview. The status has not changed since. What does it mean? Can somebody please explain.