bRAND NEW NOTE 5 MUST BE REPAIRED.

After a total stuff around getting my Note 5 and transfering everything I decide to play a bit, and discover when you use the stylis there is a blank spot in the screen,when you use your finget it works in that spot, but not when you use the stylis in that spot, our local MTN lot say sorry you have 7 days to discover issues, we will only repair not replace... its 11 days old of which a few days were wasted as MTN could not supply a sim card, is this normal for your top phone to have a issue like this when new and what is the solution as I am not happy having a phone repaired while still brand new. Suppose my mates with Apple phones will be saying \told you so\". I lost my index finger so cant not use the stylis which is why I have owned every Note model to date. THIS PHONE IS TOO COMPLICATED TO USE EVERY APP IN 7 DAYS, ITS BEEN USED 10 DAYS."