Bhuniya's letter is in response to the resolution that 39 Congress MLAs had adopted appealing to Bhuniya to step down from the post of PAC chairman, an issue which has rocked the party since the past one week.
The Congress wants CPI-M's Sujan Chakraborty appointed for the post.
Bhuniya accused Opposition Leader Abdul Mannan and state party president Adhir Chowdhury of "conspiring against him".
"Mannan had deliberately misguided the party. His intentions were to humiliate and insult me. Both Adhir and Mannan are conspiring against me and trying to project me as a 'anti-party' activist. I am a loyal soldier of the party for last 46 years," Bhuniya told PTI.
