South-Africa - Beiging- Manila

We are flying from SA to Philippines on 28 March 2018. We are flying with air china with a 14 hour stopover in Beijing. Are we eligible for the 24hour free transit into Beijing as country A is South Africa, Country B Beijing and Country C Manila? Or do we need a Visa. If we do why are we not eligible? Would really love to do a day trip and some sightseeing. Will not be longer than 24 hours. We we come back on the 11th of April we have another layover of 14 hours.

Your advice will be highly appreciated as we are getting different opinions from everyone even the embassy in South African are not sure...

Thank you!