Bajaj Finserv — Wrong collection of emi thro ecs

This is regarding a LAPTOP purchased from Pune through loan facility form Bajaj Finance Limited.
My son Karan Mehta had availed a loan facility for purchase of Laptop from Pune, the Loan Account Nos. are mentioned below:
402CDDHW982666 (Rs. 43, 101),
402VSDHW983587 (Rs. 648),
402VSDHW983464 (Rs. 748).

Now I would like to inform you that all EMI of said loan has been cleared from bank and he has obtained NO DUE CERTIFATE also from your Company on[protected]. After clearance of all EMI and getting No due certificate from you the amount of Rs. 3589 has been debited in his account stating that “DIRECT DEBIT BY BAJAJ FINANCE” on[protected]. In this connection he has written several mails to you but there is no response from your side even after providing following details to you through email
• Providing the whole loan statement,
• Specific monthly statement,
• Specific date statement of my bank account
• Explaining the same thing again and again on call to customer care executives.
If it was a legit debit then I need clarity on the amount charged by Bajaj Finance and if it was a wrongful debit then please return it ASAP.