I am facing the same issue. For any others check this also https://developer.apple.com/forums/thread/126314?answerId=405100022#405100022
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Me too from India. My Card is working with in app purchase but not for Apple Developer Payment.
It is something faced by so many users. I am facing it too. No support. Singapore support team sucks. If I can allow a negative ratting I will give -100 to the support team.
Check this also https://developer.apple.com/forums/thread/126314?answerId=405100022#405100022