BSNL — Bsnl FTTH first bill

My complain is regarding bsnl FTTH first bill.In my FTTH account under product details it's mrntioned that there is 100% discount on four categories modem & ont security deposit, modem and voice installation.In the first bill discount for 3 categories is provided, but voice installation discount is not provided so 500 Rs extra is there in bill.Already I have been charged 1000 for installation by LCO.Another important fact is even after one month of getting connection voice facility is not yet enabled by BSNL.