IGL — Additional security in last two years

My BP no is[protected] I have already paid a additional security 500 in march2021 and now in March 2022 igl have applied extra 500 in this bill due to extra cunsumption in blill every year i have to pay 500 extra in name of security where I have already paid 6000 at the time of connection we have a zoint family there fore our consumption is more and what about the nuclear family please look at this matter urgently