Bharat Petroleum [BPCL] — WRONG PRICE- Extra charged on invoice

Address:

Ambernath

I've booked LPG cylinder on[protected]:30 PM at that time price was 950 RS, paid the amount via UPI on same day payment was successful order No 41215 (Complaint case no.[protected].
But now when the delivery guy came home today[protected] he is asking for 50 Rs extra saying the price has increased from today.
This is wrong practise done by disrtibutors/bharatgas, where i paid the full amount on the booking day itself but now when the prices are increased at the time of delivery they are asking for extra amount. if that is the way then they shuld have deliveried the cyclinder on the booking day itself.
If the price was increased after the day i've paid for the LPG, then they must not have charged extra. as i've already paid.

Also one thing to note the price is still not increased on BPCL App it is still showing 950 rs as of today. but the invoice asking extra 50 rs as opposed to online payment(which is already done on yesterday).
Attached screeshot of price on[protected]

Distibutor:- Ranu Gas Ambernath