Whirlpool India — Service repair

I had a complaint of gas stroking in last july people from customer care came and serviced and took rs2500/- and after 9 months same complaint and they again ask for 2500. they do defect servicing and they make sure complaint repeats and they again ask for 2500/- for this i need to wast time, money and energy with so called non responsible cutomer care.

please resolve this issue. they cheat with different dealers.