No receiving Two-Step Verification code

Amazon made Two-Step Verification mandatory on my account. I am signed up with a Google Voice number and didn’t usually (if ever) have a problem with Amazon but now I am not getting the code and when I request a call, either Amazon or GV hangs up on it upon receipt so I am locked out.

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What can I do, or is anyone else experiencing this?

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How do I contact Amazon if I can’t get into my account?

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