Iphone 5 contacts disappear and linked with old one?

My iphone 5 contacts all disappear and my old iphone who i gave to my uncle all his contacts appear on my phone. I backed up my phone to see if i can get my contacts back and still nothing. I deleted the icloud from my phone and all of my uncles contacts disappear from my phone but my contacts still are gone. I told my uncle to delete the icloud account on my old phone as well, but still the problem continues. Just now i backed my phone again and i got my contacts which i was happy and thought i fix the problem but when i went to setting to see if there was an active icloud account i saw that there was the account on so i deleted it again and all of my uncles numbers appear again. I don't know what to do to fix this issue. Has anyone experience the same issue, please to tell how you fixed it thanks a lot.

Http://tecnolreviews.blogspot.com/