Indian Oil Corporation [IOC] — regarding the issue of sudden increase in price in lpg gas

Address:

new bangaru colony, 600078

Respected sir/ madam,
I would like to state two issues.
First, i have booked my indane lpg on 22/01/2020 and made the concern amount of rs.734 as mentioned through online. Due to sudden increase in the lpg price which is after my booking date and my payment. The delivery boy insisted to pay the difference of amount increased.
What if the price have dropped, will the delivery boy or the indane gas agency returns our money? Or what if i bought the cyclinder day before they have announced the price increased, do u come next day to collect the difference amount. Do you think we are fools. We can't just pay whatever you ask. I have attached my bill with this mail.
Secondly, please do check the photos of the delivered indane gas. Do check the condition they bought it. Is it really safe to use. I don't know whether they sucked the gas or not. Do you think, if you have delivered the gas we have to use. Won't you check the condition of the cylinder before it gets delivered. Hopeless service.
Do make some quick solutions to solve the above issues.