The Congress candidate for Antagarh (ST) seat Manturam Pawar, then considered an Ajit Jogi loyalist, had withdrawn from the fray just a day ahead of the deadline and was later expelled from the party.
The tape purportedly contains conversations suggesting money exchanged hands.
The tape purported has conversations between Amit, son of the state's former chief minister Ajit Jogi, Raman Singh's son-in-law Puneet Gupta, Pawar and former Jogi loyalists Firoz Siddiqui and Ameen Memon.
The main opposition party demanded Singh's sacking and a Supreme Court- monitored SIT probe into the matter, while BJP rejected the allegations, saying it was the result of "infighting" in the state Congress.
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Raman Singh also trashed the allegation as "baseless" and a bid by the Congress to "drag BJP and his family" into controversy, while Ajit Jogi dismissed the charge as "completely false".
"Raman Singh has disgraced democracy. He misused his power and black money to influence the democratic process," Baghel told reporters.
He also asked Prime Minister Narendra Modi to set up a Special Investigation Team (SIT) to probe the matter under Supreme Court supervision.
Baghel said Congress had smelt "foul play" soon after Pawar withdrew his candidature at the last minute and even complained to the Election Commission.
"Now the audio tape has proved how the ruling party misused its power to win the election," Baghel said.
The state Congress president said the matter will be discussed with Ajit Jogi before a "complete report" is sent to the party high command, he said, adding Siddiqui and Memon will also be questioned.
"As far as Ajit Jogi is concerned, he is a Congress Working Committee member and only Congress President can take action against him.
Ajit Jogi termed the episode as a "conspiracy" against him
and his son.
"My reaction was sought by the newspaper (which published the story today) about a month back and I had told them that it was completely false. I had even told them I will file a defamation suit if such false allegations are levelled against me," he said.
Jogi said in his complaint that the newspaper had published a "false" story and posted it on its website with a forged audio tape.
"My voice and that of my father have been doctored in the tape which would be proved after examination by experts," Amit Jogi said and demanded action against the newspaper under Information Technology Act.
Rubbishing the charge as "baseless" Raman Singh said BJP had no role in Pawar's withdrawal from electoral fray.
The state BJP also stood by the Chief Minister and rejected the allegations.
"Chief Minister Raman Singh is not at all associated with whatever has been published in the newspaper and even his son-in-law has clearly rejected the allegations levelled against him," BJP spokesperson and MLA Shivratan Sharma told a press conference.
He said the audio tape is the outcome of a "running feud" in the state Congress.
Addressing reporters in Delhi, AICC Communication Department Chief Randeep Surjewala said," Keeping in view his tall promises of not allowing corruption at any cost, Prime Minister Narendra Modi should immediately sack, dismiss or force Chhattisgarh Chief Minister Raman Singh to resign. The matter should be probed by a sitting Judge of the Supreme Court."
"Examine the role of all by including that of Ajit Jogi or any other Congress leader's conduct. Since the Chief Minister holds a top Constitutional post in the state, he should immediately be asked to ensure a fair probe.
"Congress also assures that it will take appropriate action against its leaders after the probe finds anything against them. Congress stands committed to take action on the basis of the outcome of the probe," Surjewala said.