Accountant fees

We have registered a private limited company in the year 2012 to provide industrial technical services, until October 2013 we didn’t have any revenue, after that we started getting few orders and now we are doing fairly well. Recently, we have appointed an accountant (consultant) to manage return filing on TDS, ST & VAT and to take care of accounting few invoices ( approximately 20-25 invoices per annum). We haven’t filed income tax return yet for 2012-13, 2013-14 & 2014-15. Now we are in progress to complete the task, couple of day ago accountant said that he has completed all accounts for 2013-14 & 2014-15. Now he asks fees of 60,000/- (2013-14) and 1,00,000/- (2014-15) and 12,000/- per month for 2015-16 april 2015 onwards. I am bit worried and don’t have any idea about accountant fee structure etc., Can you please advise me the realistic fees peoples are offering in the market, so that I can be confident to move forward.