Icloud id on a clean iphone 6 second hand.

I bought an iphone 6 180$ on kijiji was locked to Telus and i am with Bell, i asked him to unlock provider and he say he will call them asap to sim unlocked it , beleive it or not it was done next day when i put my bell sim. But suprise the iphone ask me for icloud account but is not lost or stolen and imei is clean i already verify it before buying it . Now the guy dont answer hes phone, text, and e-mail is hide by kijiji. I write kijiji everyday for help finding he's e-mail but no answer.. now.. what im supposed to do ?? I repeat it i payed 180$ for it !!! I have proof and ready to tell all iphone info !