[Resolved]  Flipkart — Payment Issue - Transaction was declined on basis the basis of risks check

I am trying to make a purchase using any credit card. I have used Flipkart many times before and amusing with other vendors (eg Amazon) regularly. I received the message "transaction was declined on the basis of risk checks" (see attached screen print).
Please advise how to clear this, so that I can make payments as before.
I wish to make a purchase.

I have subsequently received one standard response after another promising this issue will be resolved in 24 hours, 48 hours... It's now 1 week later!! Appalling response from customer care. No response from anyone with any sensible information. Just the same standard responses. Seems impossible to get to someone who can resolve the problem.