Indian Oil Corporation [IOC] — Fraud at Petrol Pump/Petrol Quantity

I have a hero duet scooty. My petrol capacity is about 5.5L . But recently(08.05.2023) i filled petrol at Shri Jalaram Filling Station here at Jaykaypur, Rayagada district. It cost me ₹700, i have never paid that much to make my tank full, even though i had some petrol in my tank already. The screen reflected ₹700.3 and 6.54 L, and i was astonished to see that. That is outright fraud. I have never paid that much to fill my tank when my petrol bar was blinking, i understand that the number might fluctuate for various reasons, but that much difference is questionable, given that my petrol capacity isn't that much. I didn't question them at that point because i myself wasn't sure about the capacity of the tank, this vehicle is driven by mom, and i live in a different city. And according to my mom, the maximum she has paid till date to fill the tank is 500, when the petrol bar was blinking.