Nokia India — regarding nokia 8 sirocco mobile which is a premium set of nokia

Address:

358/1, S.K.NAGAR/P.O-PRAVASH NAGAR, Kolkata, West Bengal, 712249

I have a Nokia 8sirroco set which was purchased on 25jun 2018 .from the last one month a issue of black half moon shaped black spot is appearing on right centre side of mobile. When I went to customer service centre srerampore West Bengal the service manager simply told this is physical damage I said there is not a single scratch or screen deformation then how could it be a physical damage he said power button is being pressed so it might happen .so I want to know does this happen usually then it should be mentioned on manual that power button should not be pressed . If such a thing happens with a premium set will any body purchase such type of expensive set not myself and ofcourse the Nokia set.