Scam @Bharat Petrol Okkiyam

I am regular to this petrol bunk. Tonight, I went there and asked to fill petrol for 300 rs. The worker there put 50 and then try to act that it was a mistake and then filled for 250 again. The scam is that for the 250 rest, it resumed from previous 50 and didn’t start from scratch. Since I noticed this and asked he tried to make it look like a mistake and filled 50 again. Be careful and this is also happening in Indian petrol bunk on Okkiyam too.