Want to know the logic of reserve list in recruitment

Sir I want to know when there are unfilled seats against the notification issued for a financial year and candidates are available in waiting list against unfilled seats(due to non joining of candidates in first round) then students have right to take that seats.Where we have all RTIs stating there are unfilled seats due to non joining of candidates.then what action we can take against recruiting agent. In our case IBPS conducted exam for PO5 and maintain a waiting list but after one year it does not clear full reserve list because 5 banks did not report there unfilled seats to ibps irrespective of that they participated in next year recruitment. then what action can be taken against ibps and banks.