EARTHLOVER: There are no available statistics on things like what % of visas get interview, rejection etc. Since you got the call it is better than getting an outright rejection, which is what happens in many cases. This basically means they had some doubts and have given you an opportunity to address them. Every case is different and any number of things can create doubt in the minds of an officer.
There is so much fraud in this country with all these crooked "consultants" trying to make money at any costs ... making fake bank loans .. manufacturing documents etc. that we are all paying the price. Try to put youself in their shoes .. how can an officer distinguish the authentic applicants from fraudulent ones?
So don't worry about it, just hope for the best.
CSIC member in Kerala.
www imcanvisa com