We have 64G Iphone6S Plus. Purchased used in May 2016. Apple verified it's 'clean', verified that the AppleCare is valid and registered to our AppleID. 'We are good to go!' they said. We have all this in written documentation from Apple. The phone has worked fine for months. Last month it was acting up, shutting down by itself, etc. We called Tech Support. They said do a 'Restore'. Ok, sounds easy right.. So we do a Backup, then restore... The device comes back and has locked itself to an AppleID that we do not recognize... It has associated itself to someonelse's AppleID! We did NOT release the device from our AppleID. It is also NOT the AppleID of the previous owner. We checked with them, they don't see this device in on their account. Ok, so we call Apple expecting them to remove that AppleID and then we can carry on.. But Apple Tech Support will NOT without very specific details included on the 'Original' receipt. Not my receipt.. The original receipt!. Well, I don't have that.. Who would?? I have provided Apple with dozens of pages of documents with all the receipt details they want as well as documentation FROM APPLE THEMSELVES where they state that this device SN is registered to our AppleID and belongs to us! Apple Tech Support doesn't care. They have an illogical checklist to fill out and no one cares to help... and no one cares that I have a $600 brick on my hand, only because Apple won't listen nor acknowledge their own system has a problem. At this point I have spent hours on the phone. Worked this from several angles with at least 4 senior advisors and have had this escalated to iCloud engineering and the same answer... I need an Original Receipt!! Ok, then I'll just invoke my AppleCare exchange and get a new phone.. Well today they stopped that as well. They won't honor their 'Replace for any reason' warranty! Apple Tech people are amazed at the long list of notes and tickets on this device.. 'WOW' I heard today from one tech. Tech's have admitted that this isn't right and 'We'll take care of it', only to have it passed off and then they don't respond to email or phone calls.. So I'm stuck! Locked into a Cell plan with a phone that Apple won't honor warranty one or simply fix the issue on. I am hoping to get awareness of this issue and see if others have been screwed in a similar way. I have received good Apple support in the past on other issues with my ipods and laptops.. But this is way over the top horrible! This is such a simple case if Apple would just review the data and get out from their checklists, but we have not been able to find an associate with any authority to actually just make this get fixed. I simply need a new phone thru the AppleCare program that we paid for! Ideas? Is there a magic Apple Escalation manager or team we can work with? Any help appreciated!