Display ONLY ONE $term (Out of 4 terms) from a Custom Taxonomy and CPT

OK, so finally after searching for days i was able to solve my problem!!
Just had to remove these two lines of code:

$terms = wp_get_post_terms( $post->ID, 'service_cat' );

                    foreach($terms as $term)  { 

With this line instead:

$term = get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'taxonomy' ) );

And that solved my issue!!
Thanks also to this post: https://www.smashingmagazine.com/2012/01/create-custom-taxonomies-wordpress/
Thanks to the people who tried to help!!

JA Armira