Just an update, brought it down to the service center at Somerset. Sent in during lunch hour and collected around 7.30pm. Customer Service representative said it was an software error and that the technician flashed the phone. However, on starting up, the top left still not responsive. Asked the customer service representative to try it herself and she agreed it's still not responsive.
She brought it back to the technician again and a few minutes later said they will replace it will a new set. New set was given to me about 15 mins later. Boxed wasnt sealed so not too sure if it's a refurb set, but all is well now.
Thank you all for the advice!
