Confusion Rains

And then some things just dont change...like the petrol bunk attendants and the tactics they use to cheat you of your hard-earned money.
When I went to fill petrol yesterday at this HP petrol bunk in Jayanagar...I handed over the credit card to the attendant and asked him to fill for 200, repeating the amount in both English and Kannada, lest there be any confusion.
And the guy slowly pre-sets the dispenser to 50...I notice it just in time to remind him that it should be 200, for which he smiles sheepishly and says "I thought it was 50"...well, either he is extremely dumb (to think someone would accept a credit card for 50) or he thinks I am dumb (to fall for his explanation)...
And after this, he sets it to 150...at which instance I have to remind him in no uncertain terms that he has to fill for the entire 200, since he did not initially fill for the 50...another sheepish (even a little defensive) grin and in goes 200 worth fuel...I skip the usual "thanks"...and am on my way...

Anyone with any pointers on where to complain about such instances (as complaining with the Manager yields no results) would be highly appreciated :)