F1 visa Refused under section 221g

Kolkata embassy refused my f1 visa under section 221g as they didn’t know about my pervious school whether is genuine or not. They hand over me white color paper. I called my school they provide me one number they said call on this number and you will get all the information my pervious school is accredited by USA board and when i called them they told its 100% genuine and eligible all over the world. Visa consulate kept my all academic certificate. I just want to know how much time it can take. I am student of bachelor i am really worried about my future. Can they refused me even thou after knowing that my certificated is genuine.

There is no set processing time and it can take anywhere from few weeks to several months. If the documents are genuine, then they shouldn’t deny the visa.