China Visa Extension

My Visa expires I February 14 2020. I work in China but currently on vacation in South Africa. I was due to return on 5 February 2020, however due to the Corona virus my flight has been cancelled by the airline company. How can I get a Visa extension . I am now in Durban KZN and don't want to lose my visa entry by a few days.
Thank you kindly.
Concerned expat.