HP Petrol — Will not give petrol for less than Rs. 50

Hi,
The petrol pump owners are now refusing to fill petrol for less than Rs. 50 at a time. I was running really low on petrol, and unfortunately, my purse got stolen. I had only 30 Rs as change in my pocket and when I tried to fill petrol for Rs. 30, they refused saying company policy restricts them.
After I told them that I needed this as an emergency, they did oblige...but I am curious to know if there is really such a rule that petrol will not be filled for less than Rs. 50.

Thanks,
Geetika
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