You can't call Amazon right now. Here's how to get help quickly.

1) Log in to Amazon

2) Go to Live Chat: https://www.amazon.com/gp/help/customer/contact-us

3) Start a chat with their bot (you'll see a giant button to do this)

4) Type "representative" in the box, and then click that you want a live chat

Don't try to chat with the bot itself, as it's useless.

Edit: The chat reps suck (see posts below). If they don't help much, ask for a supervisor. They will have one call you, so that's one way to get phone support.