In the letter dated April 6 sent to the Central Bureau of Investigation (CBI), Sen said he would be committing suicide any moment as he felt helpless as "unscrupulous persons and cheats in the society" had put him in a position in which he was unable to refund the "public money" collected in his name.
"All the names mentioned in this letter must be treated as an FIR for putting me into a situation of and/or provoking me to committing suicide. This is my last statement", he said, in the letter which is in the possession of IANS.
Sen, who absconded after his chit-fund went bust, was arrested with two other senior officials of the company from Sonmarg in Jammu and Kashmir Tuesday.
Sen said he entered the media business after a Bengali daily started to attack him.
However, he mentioned towards the end of the missive that his business empire collapsed due to his entry into the media domain, the extortion by various persons and the blackmail by his own staff.
He named a journalist (who later became a Trinamool MP) for having complained about his company to the West Bengal government, and starting a campaign against him.
"To combat the media attack, I thought I must enter the media business," he said.
Sen said after he purchased a TV channel, the owner-editor (who also later became a Trinamool MP) and the journalist of the paper that had earlier attacked him came to him with the offer of a Rs 60 lakh-per-month arrangement with the newspaper for running the channel.
The journalist was appointed in a top position of the channel at a salary of Rs 15 lakh per month.
"(The paper) has also given me assurance that on execution of this agreement they will protect my business from the government, i.e from state government and central government and I will be able to get a smooth passage and they assured me that they have very close connection with present CM of West Bengal i.e Ms Mamata Banerjee," Sen said.
He said in the past two years, the paper had taken Rs 20 crore from him for running the channel.
"Various time they have taken cash under various causes shown to me and also apart from that for running the channel for the last three years including the payment (cable operators) not less than Rs 2 crore per month," Sen wrote.
Sen said though he purchased the channel and spent not less than Rs 50 crore for it, a Trinamool MP "along with his few miscreants came to my office and forced me to sign some document and letters, which I signed without going through the contents thereof and after they have gone, I read and found that they have got me to sign as if I have sold them (the channel) for a meagre amount of Rs 55 lakh," he said.
"They also got me to sign as if I have transferred them (a) newspaper (name of the newspaper) which I have never done," he said.
Sen also accused a minister in the Tarun Gogoi government of Assam of having "cheated him".
"For the last six months he has taken from us not less than three crores, all by cash, and some vouchers have been signed by his office executives... This amount is also to be returned to the company for paying up the Bengal area creditors".
Sen said the advocate wife of a prominent Indian minister, whom he called on, had requested him to help her set up a channel in Guwahati and support her by extending Rs 42 crore to her company. He said during a period of one-and-a-half years, she was paid Rs 1 crore as consultancy fees.
The letter also accuses some other Congress leaders of Assam as also a senior official of a leading football club of Kolkata, apart from some journalists, media owners and others of having fleeced him.