Hindustan Petroleum Corporation [HPCL] — surrender of 5 kg hd gas appu cylinder

I have purchased 5 kg hp gas appu cylinder from rashmi gas service, vila parle west, mumbai in december 2016. The cylinder is partially used and i want to surrender the cylinder. Rashmi gas service has claimed that this cylinder can only be purchased, there is no facility for replacement or surrender tel no - [protected]. They suggested me to approach hp gas dealer. The dealer in juhu, juhu gas service is not taking calls[protected]/26604463, so i spoke to the dealer in andheri, j b nagar - siddhivinayak gas service[protected]/[protected]. They told me they would not be able to return the deposit and i should speak to rashmi gas service only. There is no official documentation for surrendering 5 kg cylinder by hp gas on their website.