Nokia 5300 — nokia care centre fooling people

sir
My nokia 5300 phone is not recognizing the voice and is under warranty. It seems there is some problem with the microphone. There is no other problem in the phone as of now. i went to the nokia care centre and after nearly 1 hr of shoving, they finally told me that my phone is liquid damaged. i continuously insisted that never ever any drop of liquid seeped inside. But finally i had to acquiesce that "my phone was liquid damaged" as i had no other option. They were very ill-mannered and ill-bred. The manager even went to the extent of telling me to take my phone back. But the story doesn't end here.
When i told them to repare the phone, the engineer finally came up and told me that there is some dust problem in the microphone and it needs to be replaced. i asked them to change the microphone as my phone is under warranty and dust et al is well covered under warranty. But he refused to do that, saying as they had detected liquid problem earlier, they wont cover this under warranty. this made me furious. i asked them what the hell has microphone's dust problem to do with the liquid problem. But instead of giving any valid reasons they just refused it rudely. i was shocked as any other logical person would be.
i asked them finally what are they going to do if i give them for repair. they told that they would be changing the microphone which has got a dust problem. so i took the phone back as it was no point talking to them anymore.
Now its very conspicuous that they were trying to make a fool out of me. they were changing the microphone and telling that some part of the phone is liquid damaged but that part is working very fine and because of that part where according to them liquid seeped in, they wont give warranty on microphone which has nothing to do with liquid damage. i am still not able to believe how can a brand like nokia give such a ridiculous solution to the problem for a mere microphone. i am furnishing all the relevant details below:
Pratish Raj
Nokia 5300
IMEI no: [protected]
Warranty expires on 12/07/09

The centre which is cheating people has got the following address:
Nokia care centre
opp. Impcops hospital
LB road Adyar chennai