National Highways Authority Of India [NHAI] — Non issue of NHAI bond certificates

Address: b t kawade road. Ghorpadi. Pune

I, Pradip Ambekar, deposited 22 Lakhs for 220 bonds on 24 March 2021 from my Hdfc bank savings acct.
This has been withdrawn from my acct, towards NHAI by cheque number 196260.
I do not have a demat acct and hence, opted for physical certificate.
As yet, I have not received any acknowledgement or any certificate on my postal address.
My mobile is [protected].
Kindly guide me how to proceed.
Thanks