Indian Oil Corporation [IOC] — Fraud practises by the staff

Address:

560068

I asked to fill fuel for 1000 rs. The worker started filling and stopped the meter at 300.. When i asked why, he said he heard it as 300. Which is absolutely #! Then he continues filling but at the same moment another guy comes up to me asking for payment, trying to distract me from watching the meter.
The other guy stops the meter at 700 and claims that he already filled fuel for 300 initially. Another #!! This is where i was aware to notice that he started filling again from 300 itself.
When i questioned him he acts like dumb as if he don't know anything.. When i questioned more the second guy told him to fill till 1000.
These fraud people have done this to me not just once but thrice!