IDFC Bank — IDFC Bank not crediting maturity amount in my account

I have 4 no IDFC Long Term Infrastructure Bonds. Maturity date- 21.02.2021. Horrible experience with IDFC First Bank. First Bank in India which instead of Speed Post hired Aviral Courier ( A Defunct Courier) with a malintention of creating confusion.
I have uploaded my bank details, cancelled cheque, PAN card copy on the link provided by them on 18.03.2021. ( Screenshot attached) Also by mail dated 15th March, 21 in response of their press release dated 13th March, 21. Bank through its mail dated 31st March confirmed receiving bank details. But no payment.
On my complaint at National Consumer Complaint Forum dated 27th March, IDFC First Bank team committed on 30th March to credit the amount in my account within 3 days, but no credit till date. ( Proof attached)
I have sent them 18 reminders by mail at regular interval and several telephonic calls but IDFC Bank never bothers any thing and enjoying on the poor investors amount.
I am a senior citizen, helpless person. Kindly help me to persuade bank to credit my redemption amount.
Sukhvender Pal Singh
Folio no- IDB0221942