Infrastructure Development Finance Company [IDFC] — IDFC Infra Bond Tranche 1 - No redemption received

I have written to them so many times, that the link which is present to update bank details doesnt work.
https://ris.kfintech.com/clientservices/isc/coacob.aspx
Errors saying "Select account type"

https://ris.kfintech.com/clientservices/bonds/bankmandate/bankmandate.aspx .
Errors saying INVALID Folio number : IDD0264149.

I have emailed all relevant documents for BANK detail updation, but I have not received any confirmation for money transfer.

They keep sending back reply saying update details .with same above link, which is not working .

Please help