Plz help!!!

So im sick of this nonsense!!!! I get account from giveaways and free but people just cant stop changing the password!!!!!I won a giveaway for an minecraft account but the same guy changed the pass!!After that an admin helped me and he changed the pass too!!What is it with those guys?!?!?

I just dont know whats going on!I played on a prison server on the giveaway account and i was rich and someone changed pass,and also i played on another one and same thing happened!I dont wanna srsly get tricked again!

Plz tell me if the account expired or someone changed pass after a few days!!