Ford Fiesta — REFUSED TO REPLACE THE PART UNDER WARRANTY

We complained about some problem in the AC at the time of service, Bhagat Ford Jalandhar told us that compressor of AC is not working properly, which is to be changed under warranty, at present not in stock, will be ordered to chennai, and we will replace on reciept of delivery from Chennai.
After a follow up of about 10 days, Co. told us that they have got the compressor and called us to get the compressor replaced, but when we approched them for replacement, they are denying to replace it under warranty.
After more than 2.5 years of purchace of the Fiesta, having regular extended warranty and paying respectfully, if once we are in need of some replacement of some part, seeing the negative attitude of the Co, we are really worried about the future to pay more to the co. or to maintain a product of Ford.
Please do the needful.