Indraprastha Gas Limited [IGL] — Totally unjustified security deposit of Rs 1000 being levied by IGL

Just like many other people, IGL has literally "imposed" security deposit of Rs1000 in our bill. According to them, they are levying this on people whose average monthly consumption is more than Rs1500. First of all, our average monthly bill is within Rs1000, so this explanation doesn't apply on us anyways. Secondly, even for people whose average monthly bill is more than Rs1500, this security deposit out of nowhere is completely unexplained and unjust. A separate security amount had already been charged by IGL from every consumer at the time of installation.