Disable or remove custom option plugin through functions.php

How can I disable or remove a custom plugin’s option through functions.php?

The plugin’s option looks like this:

$  customoption = lisfinity_get_option('membership-phone'); 

I can call this with echo in every page and appears, but I want to remove this option through functions.php with a Woocommerce condition. How can I do that? I attached my bad code for example. My code works and display echo, but can’t disable option. This is my woocommerce conditional code:

        function has_bought_items() {                    $  bought = false;       $  prod_arr = array( '2881', '2887' );       $  customer_orders = get_posts( array(         'numberposts' => -1,         'meta_key'    => '_customer_user',         'meta_value'  => get_current_user_id(),         'post_type'   => 'shop_order',          'post_status' => 'wc-completed'     ) );     foreach ( $  customer_orders as $  customer_order ) {             $  order_id = method_exists( $  order, 'get_id' ) ? $  order->get_id() : $  order->id;         $  order = wc_get_order( $  customer_order );                  foreach ($  order->get_items() as $  item) {                         if ( version_compare( WC_VERSION, '3.0', '<' ) )                  $  product_id = $  item['product_id'];             else                 $  product_id = $  item->get_product_id();                           if ( in_array( $  product_id, $  prod_arr ) )                  $  bought = true;         }     }               return $  bought;         }              if ( has_bought_items() ) {   $  customoption = lisfinity_get_option('membership-phone'); delete_option($  customoption');    }   else {     echo 'dasd';  }       }   add_action( 'wp_head', 'my_custom_function' );