The audio clip is of a phone conversation between the CPM chief's son and the complainant that allegedly took place on January 10 has been doing rounds in the media.
BJP leader P K Krishnadas had alleged that the campus was an SFI stronghold and that the principal was denying the ABVP members the right to carry out their organisation's work.
The girl students alleged that they were threatened and abused for not asking permission from SFI before going home, missing the 'Women's Wall' event that was arranged by the ruling CPM.
Rajkumar was a financial agent from Idukki who arrested by the Nedumkandam police for suspected financial fraud on June 12. He was held in custody and allegedly tortured by the police.