Muthoot Finance Limited — Non refund of ncds amount after maturity

Website: Muthoot group.com

I was allotted 100 ncds of rs 1000 each of muthoot finance in the year 2016 through sbicapsec online. The ncds are matured and due for refund on 12 thmay 2021. But sofar I did not get the amount. I wrote several mails to the company. Also tried to contact over phone. But they are not responding.
Allotment advice number [protected]
Application number 20340469