Alternate recipient

Hi there,
I need to change alternate the recipients to my contact form, so I wrote some code, but the contact form is not sent. Nothing happens…
Any clue someone ?

function wpcf7_do_something (&$WPCF7_ContactForm) {
    $emailpick = $wpdb->get_var("SELECT numberofsent FROM wp_mailsent WHERE ID ='1' ");
	if ($emailpick == 0 ) {
	$mail = $contact_form->prop( 'mail' );
	$mail['recipient'] = "Mike <[email protected]>";
	$contact_form->set_properties( array( 'mail' => $mail ) );
	}
	else{
	$mail = $contact_form->prop( 'mail' );
	$mail['recipient'] = "Mikebis <[email protected]>";
	$contact_form->set_properties( array( 'mail' => $mail ) );
	}
	if ($emailpick == 1 ){
		$emailpick == 0;
		}
	else {$emailpick == 1;}
	$wpdb->update($wpdb->mailsent, array("numberofsent" => $emailpick), array("ID" => 1));
	}
add_action("wpcf7_before_send_mail", "wpcf7_do_something");

https://ww.wp.xz.cn/plugins/contact-form-7/