L&t Infrastructure Bonds — Interest cum redemption cheque of l&t infrastructure bonds received but the owner (my father) is long dead & gone!!! kindly advise

Address:

Mumbai

We (myself and my mother who are the son and wife of Mr. Sravan Chaudhuri) have received an A/C Payee Cheque of Rs. 42, 570.00 of IndusInd Bank dated 23/03/2021 in the name of Sravan Chaudhuri (now deceased). He is survived by his only son (myself) and widow Ms. Sermistha Chaudhuri (my mother). The account number for which the Cheque is meant is deactivated by the bank authorities as it was the sole account of my father. Moreover, the United Bank of India has now merged with Punjab National Bank and it has a new IFSC code.
My father had expired on 20/05/2015.

The following details are given for your kind perusal and necessary action at the earliest (kindly refer to the attachment):

Cheque No: 136677 (Account Payee Cheque)
Bank: IndusInd Bank
Client ID No: 10824729
Warrant No: 145839
Amount: Rs. 42570.00
Cheque dated 23/03/2021

Under the above circumstances, what are we supposed to do to get the amount of Rs 42, 570.00?

I had tried to call the helpline number(s) but they were not reachable. Then I had contacted the regional office of Kolkata where I was given a number which again was not picked up after 3 trials.

Finally, I spoke to the toll-free number[protected] today and the customer care executive understood my helplessness as despite repeated trials I could not get access to the appropriate number and person for the last 10 days or so to get my problem solved at the earliest. I was advised by the customer care executive to write a mail to this email ID so that it may be routed to the appropriate department. Hence this mail to you.

Kindly guide us. Kindly route this mail to the appropriate department as soon as possible and oblige. Please send an alert to the concerned department to contact me at the earliest and guide me as to the steps to be taken to solve the issue at hand.

Please help us to proceed further with the issue and kindly enable us to get a fast-track solution for this problem.

Thanks & Regards,
Kaushik Chowdhury
Ph.D. Research Scholar (Law)
IIT Kharagpur
Mobile & Whatsapp Number: [protected]