return my Hutong Card in Shanghai

You can get refund of Beijing issued transportation card only in Beijing, not in Shanghai. You can try doing it at some subway stations Capital Airport Terminal 2, Terminal 3, and Daxing Airport. For Beijing South Railway Station, you can find dedicated vending machine at underground of North Square. At Dongzhimen, you can try official service center inside Transport Hub, or CITIC Bank on the other way of Dongzhimen.