IDFC Bank — Instacred not working with IDFC bank in myntra

I tried to place some order in Myntra using instacred option as i already use this with IDFC bank.
Now suddenly order get cancelled automatically, but i get massages & even OTP from IDFC.
Sometimes it's also show's that, my registered number not linked with IDFC al though that's not right.
I don't know what to do & how to resolve it.
Please find the attachment as well to make it understands what I'm going through now