Review of Daya Gas Service

It is the worst distributor I came across. The agency is encashing the monopoly and is involved in multiple malpractices like never provide invoices. Whenever I asked invoice from delivery boy he says I don't have and in addition to that delivery boy ask for extra 20 rupees for delivery else he will say I haven't received any cylinder. Please. Please other OMC must notice and please open open one more distributor as well by different OMC.