admin-ajax error 400

When I make an AJAX call I receive the “/wp-admin/admin-ajax.php 400 (Bad Request)” error
This is my PHP

add_action( 'wp_enqueue_scripts', array( $this, 'enqueue' ) );

   public function enqueue() {
        wp_enqueue_script( 
            'ajax-script',
            plugin_dir_url( __FILE__ ) . '/ajax.js',
            array( 'jquery' )
        );

        wp_localize_script( 
            'ajax-script',
            'wp_ajax',
            array( 
                'ajaxurl' => admin_url( 'admin-ajax.php' ),
                'dede' => 1234
            )                 
        );
    }

add_action( 'wp_get_data', array( $this, 'get_data') );

public function get_data() {
    $whatever = intval( $_POST['whatever'] );
    $whatever += 10;
    $whatever;
    wp_die(); 
}

and this is my ajax.js

jQuery(document).ready(function ($) {

    var data = {
        'action': 'get_data',
        'whatever': wp_ajax.dede
    };

    jQuery.ajax({
		url : wp_ajax.ajaxurl,
		type : 'post',
		data : data,
		success : function( response ) {
            console.log(response);
		}
	});

});