What a pain. I use the same card to pay for Prime as I do for my Amazon purchases, and I've never had any problems with it. But I'm using the .ca site. If memory serves though, I had to enter my payment information separately into Prime, to pay for the membership.
Good luck on getting through to customer service if you do decide to try that
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"I danced in the morning when the world was begun. I danced in the moon and the stars and the sun". From my favourite hymn.
"If you see the wonder in a fairy tale, you can take the future even if you fail." Abba
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