Faced same issue.
My coral and Amazon pay had same last digits.
I replaced coral got new digits on coral and old on amazon pay cc.
waited till next statement but still faced same issue, then contacted cc they canceled my coral card (earlier it was blocked only).
again waited for next statement but sadly still same issue.
Now i replaced amazon cc too, but my bad luck got last digit same as new coral digits.
Then again replaced & got new digits. (as i know this time issue will be damn same).
Now waiting for this month statement (20th) hopefully it'll work now.