Contact form 7 hooks not working at all

I am trying to execute some PHP script with contact form 7 but none of the hooks working. I am using a new version of wordpress, contact form plugin. Tried wpcf7_before_send_mail and wpcf7_mail_sent

Sample code in functions.php file:

add_action('wpcf7_before_send_mail','_wpcf7_mail_sent_function');
add_action( 'wpcf7_mail_sent', '_wpcf7_mail_sent_function'); 

function _wpcf7_mail_sent_function( $contact_form ) {
    $title = $contact_form->title;
    $submission = WPCF7_Submission::get_instance();  
    error_log("test");
    wp_mail('[email protected]', 'contact form 7', 'Hooks not working');
    print_r( $submission);
    
    die;
}