<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
 <preference for="MagentoDirectoryBlockData" type="MagenticiansModulecontactBlockData" />
</config>




<?php
   namespace MagenticiansModulecontactBlock;
   use MagentoFrameworkViewElementTemplate;

   class Data extends MagentoDirectoryBlockData{

   public function getCountryHtmlSelect($defValue = null, $name = 'country_id', $id = 'country', $title = 'Country')
   {
     exit;
   }
   public function test(){
      exit;
   }