India Post — New NSC Certificate issue

Address:

Kundrathur post office, kanchipuram district.

I have issued cheque in Kundrathur post office on 16th instant for investing Rs. 1.50 lacs in NSC Scheme and it has been cleared on 18th March, 2021. I was told I would be getting sms within 3 days and I can go and collect the certificate. I cannot go without confirmation due to I am under post covid treatment and have no personal vehicle and it is not a walkable distance. The simple thing I can make a call and ensure and go to collect the same. But none pick up the call. Please let me know the alterntive method as I did mot get the SMS yet.

Thanks and regards