How to unlock iphone 5 from Sprint 1

I 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!

If the person who sold you the phone is unwilling to help you, then the only viable option is to use a third party unlock, such as a Grevy SIM card, or taking it to a cellular phone shop.

The screwy cell phone laws here in the USA seem to have caused nothing but trouble here…

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