public function unassignMedia($mediaId)
    {
        $this->getLogger()->info('Unassigning media ID ' . json_encode($mediaId) . ' From display Group ID ' . $this->displayGroupId);
        $this->doPost('/displaygroup/' . $this->displayGroupId . '/media/unassign', [
            'mediaId' => $mediaId
            ]);

        return $this;
    }