WordPress Theme Customizer dropdown page option issue

I am trying to develop a place to put a Call-to-Action in the theme customizer admin panel with an option to select a drop down of site page. I get the pages to show up in the drop down but when I try to call it into the frontpage php file, the main blog url shows instead of the page link on the call-to-action button. Here is my code:

in customizer.php:

// Page Drop Downs
	 $wp_customize->add_setting('bigblog_theme_option[page-url]', array(
	'capability' => 'edit_theme_options',
	'type' => 'option', ));
	$wp_customize->add_control( new WP_Customize_Control( $wp_customize, 'bigblog_cta_url', array(
    'label' => __( 'Front Page Call-to-Action URL', 'bigblog' ),
    'section' => 'frontpage-custom',
	'type' => 'dropdown-pages',
    'settings' => 'bigblog_theme_option[page-url]',
	) ) );

In the front-page template:

<a>">

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Does anyone know why it is not displaying the selected page in the dropdown? I have tried both get_theme_mod and get_option