Issue with Google Pay on iPhone 6 Plus

Till yesterday I was using Google Pay App on my iPhone 6 Plus (version 12.4.9) even though the app is too slow on iPhone. From yesterday evening my bank account had been deactivated from the Google Pay App and when I try to restore my Bank Account, it is throwing error.

I had raised several ticket in the app itself, no respond. I contacted the Bank but they said everything is running fine at their end. Really worried.