Maruti Suzuki India — Extended warranty benefit

Address:	New Delhi, Delhi, 110063
Website:	www.marutisuzuki.com

I, vinod gambhir bought a alto800 vxi (Dl4cas2422) on 20 march 2013 from d.D.Motors, peeragarhi, new delhi-110087. My car is driven 8200 km only till now. I have also paid for the extended warranty which was till 19 march 2016. I have recently gave my car for service on 12 march 2016 in d.D.Motors, peeragarhi and in that service i was informed that one part of air flow selector is broken form inside and as it comes under the extended warranty it should be replaced but it is not replaced. They are telling me that i have tempered the knob and because of that internal part is broken but the knob is working alright. And it is not possible to break the internal part from outside. This means i havent got the benefit of extended warranty. Now you only tell me how can i broke the internal part ?????
It is my right to get the air flow selector replaced or repaired free of cost at the earliest .