Calcutta Electric Supply Corporation [CESC] — Electric phase change and my line checking

Address:

9/4,sarkarhat lane,1st floor,Flat no.2A,Kol-700061,sai bhavan

I am a customer of CESC, I live in a 2bhk flat at sarkarhat, kolkata -700061, I want to seperate my phase from our flat common metre phase, because during 2years my bill reading is too high, whether after running water pump 5 hours everyday, and continuous lighting in night time in our flat common meter is always varied withine Rs 400-500.Hiw it is possible, I think there is something wrong withine my metre, electric line with common meter line.plx do some thing, and seperate my phase from this common metre phasecamd check my line