Hi all, just bought my iPhone x 256gb on last Thursday and phone already not working on the second day ! Went to QCD Times Square to check and they said hardware prob and asked me to send my phone to repair and yesterday they called me up for phone collection , I did asked bout what caused my phone not working and they said don't know but will provide me with a new set , but the so called new set is not sealed in box , it's just phone without cover and how can I assure that's a new phone? Furthermore what will happen with my warranty since the imei is different now ? They didn't provide and details / copy / receipt saying I replaced my faulty phone with this so called new phone! Please everyone do advise what should I do ?

Very helpful info there , thanks alot
So can we reject from receiving a refurbish set instead of a new one ?