Remove duplicated posts in the loop if post has more than one category

You don’t need to loop over each category & query them one-by-one, just query them all once:

$query = new WP_Query(
    array(
        'post_type' => array( 'service' ),
        'category__in' => $ucategory,
        'posts_per_page' => -1,
    )
);