Aside from charges of fraud against the PNB, Modi is also accused by the Indian government of laundering the proceeds of the fraud.
Modi's lawyers had contended that their client was being held in difficult conditions at Wandsworth prison and had also claimed that his mental health was deteriorating as a result of his incarceration.
Cornering Gandhi over the matter, the Union Minister suggested that Gandhi should take tuition classes from Chidambaram to understand the difference between writing off and waiving off.
"The case of Nirav Modi is under litigation that is being heard at Westminster Magistrates Court in London. We are putting all resources on the ground to ensure early extradition of Nirav Modi to India," MEA spokesperson Raveesh Kumar said.
Modi is currently lodged at Wandsworth prison in south-west London and is wanted for his alleged role in the Rs 13,570 crore loss caused to the bank along with his uncle, Mehul Choksi.
Forty-eight-year-old Modi was arrested on March 19 by Scotland Yard in connection with the case and is currently lodged in Wandsworth prison in south-west London.
Choksi and his nephew Nirav Modi, who both fled the country a year ago, are key accused in the USD 2 billion PNB fraud case. Choksi was granted citizenship of Antigua and Barbuda on January 15, 2018.
The 48-year-old businessman appeared before the Westminster Magistrates' Court via video link from Wandsworth prison in south-west London, where he is currently lodged.
The probe agency has provisionally attached immovable properties, valuables, vehicle and bank account of Choksi under the Prevention of Money Laundering Act (PMLA).
The press release read, "The request was made on the ground that money in the bank accounts were deposited out of illegal siphoned off funds from Indian banks."