WordPress Child theme fails to override parent theme css

I see the issue, there is a second call to main.css :

<link rel="stylesheet" id="faxhion-css" href="http://www.rareselect.co.uk/wp-content/themes/faxhion/main.css?ver=4.8.1" type="text/css" media="all">
<link rel="stylesheet" id="faxhion-child-css" href="http://www.rareselect.co.uk/wp-content/themes/faxhion-child/style.css?ver=0.1" type="text/css" media="all">
<link rel="stylesheet" id="plugins-css" href="http://www.rareselect.co.uk/wp-content/themes/faxhion/assets/css/plugins.css?ver=4.8.1" type="text/css" media="all">
<link rel="stylesheet" id="fontawesome-css" href="http://www.rareselect.co.uk/wp-content/themes/faxhion/assets/css/font-awesome.min.css?ver=4.8.1" type="text/css" media="all">
<link rel="stylesheet" id="style-css" href="http://www.rareselect.co.uk/wp-content/themes/faxhion/assets/css/main.css?ver=4.8.1" type="text/css" media="all">

The one you are calling with id="faxhion-css" its loading nothing its a 404 because main.css its not there, the actual main.css file its inside /assets and its already being loaded somewhere.
You have 2 options:
Option 1:
Dont call the parent CSS and put 'style' as a dependency:

add_action( 'wp_enqueue_scripts', function() {

    //* Child CSS
    wp_enqueue_style( 'faxhion-child', 
      get_stylesheet_directory_uri() . '/style.css', [ 'style' ], );
} );

'style' its the ID of the main stylesheet.

Option 2:
Remove the main stylesheet and add it back:

<?php
add_action( 'wp_enqueue_scripts', function() {
    wp_dequeue_style( 'style' );//removing main.css
    //* Parent CSS
    wp_enqueue_style( 'faxhion', 
      get_template_directory_uri() . '/assets/css/main.css' );//adding it back

    //* Child CSS
    wp_enqueue_style( 'faxhion-child', 
      get_stylesheet_directory_uri() . '/style.css', [ 'faxhion' ], );
} );

Second option will work but i dont recommend it, the first option should work too, if you are having 500 errors its more likely the <?php and ?> are not matching and 1 is missing.

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