F1 visa refused under section 221g

[Vinz Martinez]

My interview was in kolkata on 24th dec 2015 they asked me from where did you come to know about this university i told them from my school as my school is also accredited by the same board this univeristy is they told me thats impossible and told me to wait for some time after 40min they called me again and asked me for my document of pervious qualification i hand over them all my document and they said wait for few more mins after 1 and half hour they called me again and said they need more time and hand over me white slip on which was written 221g i already had gave them all my document related to my pervious qualification on the spot. There was no check on any box The slip they gave me expect one ''your application requires additional administration processing before a final decision can be made.............so on" what should i do do i need to send them any additional document and how much time it can take for verification