Punjab State Power Corporation [PSPCL] — hike in tariff

First of all i would like to bring to the notice of all consumers that price is being hiked by pspcl every year and the hike is charged from previous year, what is this logic, if the price is hiked today it should be charged from today onwards why from previous year. Secondly i feel that the subsidy given by govt. Like free electricity etc. Is being charged from us as the tariff in punjab is very high as compared to neighbouring states. If a govt. Gives subsidy just for vote bank it should be given from their own pocket. Why a layman always suffer.
Hope the team will raise this issue so that a layman could also get a sigh of relief.
Regards sunny