"I am resigning my AITMC (All India Trinamool Congress) membership and Lok Sabha membership at once. Wish you good health. Good luck to you all," Suman said in his SMS which he also send to the TMC whip in the Lok Sabha Sudip Bandopadhyay, leader of opposition in West Bengal Assembly Partha Chattopadhyay and Union Minister Mukul Roy.
The singer-turned-Lok Sabha member expressed disappointment on being insulted by a section of the party leaders.
"A section of Trinamool leaders had insulted me at Sonarpur in South 24 Parganas district today (Monday, Mar 29). Nobody has dared to insult me like this ever", he texted.
In a Bengali television channel, Suman said that he was tired of being humiliated by Banerjee and other leaders which has been going on for months, adding that he would now seek solace in music.
"But I can't take it anymore. I will go back to music, do riyaz and pen more songs supporting the people's movement in Lalgarh," he said.
Suman said that his resignation letters would be sent to Lok Sabha Speaker and Banerjee on Tuesday, Mar 30.
The move by Suman came months after he expressed his discord with the party, following which Banerjee termed him as a 'guest' in the party.
Meanwhile, Bandopadhyay while confirming the report said that they are now waiting for the Suman's formal resignation letter.
"His actions had put us in discomfort. We are now awaiting a formal letter of resignation from him," he said.
Suman, who is known for his Maoists sympathies, has been on the receiving end of the party's anger ever since he accused a section of party leaders of misusing funds allocated for development work.
He also criticised the party for not adopting a softer approach towards the Maoists and was quite vocal in expressing his displeasure over the Operation Green Hunt launched against the Maoists by the Center.