CustomerGroupConfig.php

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<?php
namespace Magento\Customer\Model;

class CustomerGroupConfig implements \Magento\Customer\Api\CustomerGroupConfigInterface
{
    private $config;

    private $groupRepository;

    public function __construct(
        \Magento\Config\Model\Config $config,
        \Magento\Customer\Api\GroupRepositoryInterface $groupRepository
    ) {
        $this->config = $config;
        $this->groupRepository = $groupRepository;
    }

    public function setDefaultCustomerGroup($id)
    {
        if ($this->groupRepository->getById($id)) {
            $this->config->setDataByPath(
                \Magento\Customer\Model\GroupManagement::XML_PATH_DEFAULT_ID,
                $id
            );
            $this->config->save();
        }

        return $id;
    }
}