IOCL — lpg cylinder

Address: Kolkata, West Bengal, 700104

Please find the attached sms of bill generation of cash memo no. [protected] against booking for con no. Cx15374581 of booking registered ref no. 386922 and the physical cash memo bill been charged from me on delivery of cylinder at my residence!
The amount was in the sms of bill generation of cash memo no. [protected] dt. 29/05/2018 against booking ref no. 386922 was rs 674/- but the physical (Hard copy) cash memo bill​no. [protected] dt. 01/06/2018 showing the amount is rs 724/-. There is a difference of rs 50/-, why so, once the cash memo was already generated on 29/05/2018 and a sms been confirmed to the customer?
Distributor has simply changed the cash memo with a fake booking reference no!

Surprisingly the distributor found changed the cash memo no. And booking reference no. Too!
Such manipulations are going on!

First of all cash memo must only be generated on the physical availability of cylinder only! And once the cash memo generated, why the cylinder not being delivered to the customer?
Secondly, why the booking reference no. Is not reflected in the cash memo?
What is the order no. Need clarification, plz!
If the cylinder is not under subsidy then because of your such mislead, why customer will suffer?

My subsidy amount is rs 179 against rs 674/- but when this cylinder i receive on this month my subsidy amount is rs 227 against rs 724/-. There is a difference of rs 48/-, not rs 50/-, why?
Why a customer should lose an amount?

You should have clarity in your process, plz!