Respuesta :
I think you should give the phone back to the owner and try getting your money back because this might be a permanent problem , and the phone might have been used by the owner and he might have made an account on the iPhone . If you want to save money by keeping the phone , you can set up a appointment with The Apple Store and they might be able to help you out ! I hope this helps you , good luck .
I had bought an iPhone 6s from app like crag. and I met them at a t-mobile store and the worker told me to be careful buying it from other ppl bc it can be a scam and if it has an i cloud Id (i think) already signed in that its worthless. If im talking about the same thing you are i hope that helped but its best to buy a phone from eBay where you can get your money back. I learned the hard way and 2 months later the phone i bought was reported stolen. >:(