IOC — not booking the gas even after the 21st day and not supplying the gas in time

sir ,
iam a Ioc consumer and my gas delivarying agency is Nataraj gas agency , new yehlenka town , bangalore , my reg no 37576, name Ragunath pk ,

normaly i used to see that some else is booking my gas cylender and taking it , ie they are not delivaring at my home and selling it .
due this problem I used monitor the booking now they are doing the problem for booking also , like even the 21 days are finished still they will not book the cylenders .
I have booked the cylender on 18 dec 09 and they cut the bill on 24th december and delivary boy done delivary after 3 days that is 27 december 09.,even though distance is 8km away .

on 15 th january at 1455 hrs I want to book the cylleder but one Mr Srinath who is booking agent at nataraj agency is denaying my right to booking and telling me that I can only book after the 20 th of the january .
if we made a compliants then they will tell that we are not doing the home delivary to your area , even we are paying 30 to 50 rs as tips to delivay boy .
other wise they will make to cry by not giving the cylinder for weeks togother etc

so , iam humbly requsting you to look into my problem and due to this complaint he should not make some more typical problem for me.

thanking you sir