First of all ,please go through FAQ section of this portal,its there right on top ,in green,third from left.This gives you literary everything on
RTI Application,format,how,where,whom etc.Your application will be addressed to Regional passport officer(for kind attn of
PIO) Worli.
You have to give background of case in brief like what you have mentioned here and ask for reasons for delay and time as to when your passport will be issued.
It is a simple procedure with assured success .
Good luck.