Whirlpool India — Control panel cost and repair

Hi, my whirlpool fully automatic washing machine suddenly stopped working last week. I called customer care and they sent service engineer next day. After looking at machine, Service engineer he did machines control panel unit needs replacement and it will cost 4200/-. As there was no time otherwise I will have to pay him visiting charges hence I agree to change it. In addition he also charged me visiting charges Rs. 450/-. This is looting by Whirlpool as normally visiting charges are not applied if we take the services.
I have two complaints here
1. This is second time part being changed in last 4 years and there is no warranty. Also it's too costly.
2. Why visiting charges are applied when I agree to change the part.

Please help!!