Indane — Leakage from LPG cylinder

I have been using LPG Indane since 2010. Everything was perfect. Last year after the delivery of cylinder we could smell the gas. Our consumption is only 4 cylinders per year. As such after the delivery of the cylinder we will keep it for at least for 2 months before use. We requested our agencies to check the cylinder and they assured it is fine. At least 4 times we would have called the agency. Ultimately when the smell was unbearable we requested them to check the cylinder and we found more than half the capacity of the cylinder has evaporated. Hence we decided to book for cylinder 2 months after the cylinder is empty. As such in December 2014 the cylinder was consumed. We booked and got the cylinder delivered yesterday 20th February. Again the same problem. We can sense the leakage of gas. Again we have to call our agency several times for replacement. I think Indane gas filling section should take sufficient precaution prior to sending them for delivery. Agency cannot do anything in this issue. Since we often read about cylinder explosion we are very much worried. Kindly do the needful. My consumer number 32864. email: [protected]@gmail.com