My relatives are here in Kunming on F-visas, that will expire on Sep 18. In order to extend their visas for 3 months, they need to provide an official letter and some other documents from the company in Kunming, who will be their local recipient organization. As I understood, it can be not necessary the same organization, that originally invited them. And not any organization can do it.

If anybody can advise, where to go for that, since their first company is out of the question? If you can help, contact please private ASAP through response form.