just received a call from one of the senior advisor from apple india.
The senior advisor had a word with the service centre which claims that the depression of screen is withing acceptable limits and is common on other iphone 6 as well. Moreover, according to them the clicking is too intermittent to be of any concern and hence will not be entertaining any replacement in this case. Repair is not an option.
Final solution provided to me: The service centre will not give me a replacement, instead the team from advisor side will send me a fresh piece in the name of customer satisfaction and quoted it as a one time exception replacement since the service centre accepted that an intermittent issue exists.
Verdict: The service center people will not entertain such issues in future unless absolute necessary. I do agree that my click was intermittent, but them telling that it was normal and screen depression is common was unexpected 😐 Now waiting for a new set, fingers crossed!