Elo hell is a magical fairy tale land that people made up so that they can blame that for their elo.
What causes a person to be at the elo they're at are sever things like:
-Luck - who is on your team , who is on your enemy team, do you ahve anyone drunk, anyone lagging, anyone on a short time frame and will afk afterwards, anyone who rages or trolls you (this can happen at ANY ELO)
-Skill- how you do on your own and how you do as a team
-Team comp - who got banned, who's playing who; is everyone playing their main, did anyone get countered
-Mistakes- biggest thing in ranked is people making a mistake and getting snowballed afterwards (play safe, lessen mistakes)
-Teamwork- TALK TALK TALK, WARD WARD WARD, MAP CONTROL IS KEY
gl and have fun season 3 
-RemainingUchiha, the one and only fiddlesticks