I still dont understand until today, why you choose to waste your money to buy a second hand iphone 6s when you can't even repair / fixed.

According to Machines support center KL rejected to repair it because it was not repaired by them before, hence the parts were not original

Obviously , they wouldn't bother to fix your phone. if i'm working there, i probably wont even. I mean, better to buy original than second hand that has no value in it and can't even be fixed. Seriously, learn to think before buying anything. such a waste in money.