"Please tell your clients to stop sending love letters to me. I am already from a well off background, If you don't stop this act, I will direct CBI to take action against you," Special CBI Judge Swarana Kanta Sharma said during the hearing.
She pulled up the accused and asked their counsel to make them behave properly.
Jain, who was suspended as chairman and managing director after his arrest early this month, and Singal were produced in court after expiry of their judicial custody while the other accused were brought from jail on court's production warrants.
The court, on August 12, had issued production warrants against them.
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CBI has filed two cases against Jain -- accusing him of receiving a bribe of Rs 50 lakh through conduits and abusing his official position to enhance the credit limits of some companies in violation of laid-down procedures.
On August 2, CBI had arrested six accused, including Jain and Agarwal.
CBI claimed to have recovered Rs 21 lakh in cash from Jain's residence besides gold worth Rs 1.68 crore and documents of fixed deposits of up to Rs 63 lakh.
In the two FIRs, CBI has named Singal, Ved Prakash Agarwal, Chairman-cum-Managing Director of Prakash Industries, Pawan Bansal, chartered accountant, Vineet and Puneet Godha (relatives of Jain), Vijay Pahuja, Totlani and Pankaj Bansal.