[Resolved]  Whirlpool India — Overcharged for refrigerator repair

I have one and half year old refrigerator and compressor was damaged. After contacting whirlpool india service. The person visited my house and mentioned compressor needs to be replaced and charge 410 rs. Compressor have warranty period of 10 years. So I thought it would be zero cost replacement. But after replacement they charged 2849 for gas charge. Now this gas is R-600a godrej refrigerant which have M.R.P 650 and same they used while filling. Now they have already took service charge of 410. what they have charged remaining 2439 ? Are they allowed to charge more than M.R.P of items ? I already observed similar issue in this forum in 2015 but still same behavior from whirlpool India.