How to unlock iphone 5 from Sprint

You have purchased an iphone 5 16 gb white from sprint from ebay in USA. I live in Europe, Macedonia. My phone is currently locked to Sprint Network USA. I tried to contact apple in US they said they can't do anything about it, I also looked at all the possible unlocking sites, no site offers unlock for Sprint. The phone came locked and I can't use any carrier here in my country. I know the R Sim chip option but I want official IMEI Based unlock. Does anybody know any solution like some employee in Sprint or anything? I already called sprint they said the guy who sold me the phone has closed his account and that I'm not eligible for an unlock. Tell me any options tweaks or tricks besides jailbreaking. I will rate your answers in terms of results please reply As soon as possible!

You can't unlock a Sprint phone. They are under the CDMA network and CDMA phones can't be unlocked.