HDFC Securities — REC Bonds (54EC Bonds)

I had applied for REC Bonds of Rs 5000000 ( RS Fifty Lakhs) as I had sold my property. The bonds were applied through RBL Bank, Gurgaon on 23rd November 2021.
The amount of Rs 5000000 ( Fifty Lakhs ) was deducted from my account in RBL Bank on 21st December 2021. (Cheque No 000003 dated 23/12/2021)
I was informed that the REC Bonds in physical form would be available
within three working weeks.
Till date I have not received the Bonds. I wish to know the reason for inordinate delay.