Loop inside a loop (loopception?) problem :(

Hey guys,

I’m new to the whole wordpress thing, and it’s my first time designing a theme and I have a problem.
On a page I need to show post of a specific category and an other post from a different category, the first category is used on other pages and that specific page should show the title, the meta and a contact form on generated by “contact form 7” which is on a post with it’s own category.

I can’t get it to work, I tried a bunch of things, here is the latest:

<?php
function tarifs() {
$temp_query = $wp_query;
query_posts('category_name=contact-tarif');
if(have_posts()):
  while(have_posts()):
 		the_post();

		the_content(); 

    endwhile;
    endif;
}
?>
<?php $temp_query = $wp_query; ?>
<?php query_posts('category_name=techniques'); ?>
<?php
//verifier articles ou non ?

  if(have_posts()):
// tend q'on recois des articles
  while(have_posts()):
  	the_post();

			$thumb_id = get_post_thumbnail_id();
			$thumb_url_array = wp_get_attachment_image_src($thumb_id, 'large', true);
			$thumb_url = $thumb_url_array[0];
 ?>
	<section class="parallax-2 module parallax parallax-single parallax-tarifs" style="background-image: url('<?php echo $thumb_url?>')" >
  	<div class="container">
  	<h2 class="tarifs"><?php the_title();?></h2>
  	<div class="left-right">
		<div class="tarifs-left">
			<?php
		    $prix = get_post_meta( get_the_ID(), 'Prix' );
    		echo '<p class="h2 prix">'.$prix[0].'</p><br />';
    		$dure = get_post_meta( get_the_ID(), 'Durée' );
    		echo '<p class="h2 duree">'.$dure[0].'</p>';
    	?>
    	</div>

	  <div class="tarif-right"><?php tarifs(); ?></div>

	</div>
 	</div>
 	</section>
<?php
    endwhile;
    endif;
?>

Would really appreciate if you could help me out :/