MTNL — about 20 days no internet connection

Address:

Delhi

about 20 days i have no internet connection 16/03/2013 to 03/04/2013 .why i pay two months bill to mtnl march and april my internet connection under gm rohini exchange.i already submitted my complaint to all official and including cmd of mtnl..but no reply from any officials .i want to know what accountability and responsibility of officials of mtnl.delhi.