Hai Phong Province’s Immigration Office (Vietnam Immigration Department in Hai Phong) - Where tourists and business people can contact to extend visa. It's official address.
Address : No 2, Trần Bình Trọng Street, Lương Khánh Thiện Ward, Ngô Quyền district, Hải Phòng city
Contact us via email if you have any question : info@visa-vietnam.org