Flamboyant Johnny left the competition after judges decided to send him home after a sing-off against Kitty Brucknell.
The Risk didn’t even get the chance to sing for survival, as they polled the lowest number of public votes.
The shocking double elimination was a cruel outcome for the group, a collection of solo singers put together by show bosses, who had received positive feedback for several of their performances.
On the other hand, Frankie Cocozza, the wild boy from Brighton, whose performance was panned by judges on Saturday night, remarkably received enough votes to stay in.
The Risk’s exit came as a shock as only a week ago they were second favourite to win the show by the bookies.
The group’s mentor, Tulisa Contostavlos was stunned as their fate was announced. The band members have vowed to stay together.
Derry Mensah said: “I don’t know what it is. I’m just happy we are here together.
Fellow member Charlie Healy added: “I feel alright. We are The Risk and we are just going to carry on.”
Fans of the group expressed their disappointment on Twitter, with Manchester United player, Rio Ferdinand even weighing in.
He tweeted: “I am not having this. Simon Cowell come + sort this out asap..the Risk are out..is this a wind up?? Credibility of the show gone down for me.”
Unemployed Robinson, 45, sang The Righteous Brothers’ Unchained Melody, while Brucknell, 26, sang Kelly Clarkson’s Beautiful Disaster.
Robinson’s mentor Louis Walsh said he was compelled to keep blonde Brucknell on as she was more likely to get a recording act.
Choosing between his acts, Walsh said: “They’ve been incredible to work with. They were both incredible in the sing-off. I have to pick the person who I think in the real world who would get a recording act and the act I’m gonna have to send home is Johnny.”
Both Walsh and Gary Barlow shed a tear for the popular finalist, Robinson.
Joining Robinson on stage, who appeared to accept his fate with good humour, Walsh added: “This guy is a brilliant singer, he’s a great character, he’s gonna have a great career. I hate to see him go home.”
Robinson said: “I wanna thank everyone who have got behind me. All the judges, everyone out there in the UK who accepted me for just being me.”
Meanwhile, Cocozza, a party-loving teenager had been criticised for his version of the Black Eyed Peas song, I’ve Gotta Feeling on Saturday night, with Louis Walsh describing his performance as “really bad karaoke”.
Lord Sugar tweeted that his survival proved phone voting was “backfiring”.
“Producers know he is rubbish but can’t do anything. Disgraceful TV. ITV have to act,” he wrote.
Tulisa’s girl band Little Mix were the first to find out they were through until next week, followed by the new bookies favourite, Marcus Collins.
Manchester singer Misha B was also thrilled to find out she was safe for another week, despite landing in the bottom two last week.
Meanwhile, X Factor alumni JLS and Florence And The Machines performed their latest singles Take A Chance and No Light, No Light.
The results show comes after X Factor managed to beat Strictly Come Dancing in the ratings war on Saturday night.
A peak of 11million tuned in to watch the Club Classics-themed week on X Factor, compared to 10.5million with Strictly on BBC.