Can a South African citizen get 30 days in Thailand and extend it after a visa run?

As a South African citizen, you can enter Thailand and receive a 30-day stay under the Visa Exemption Rule. This applies whether you enter through an international airport or a land border. Additionally, you can extend the 30-day stay for another 30 days at any local immigration office for a fee of 1,900 baht. Note that if you enter through a land border, you are limited to 2 visa-exempt entries per calendar year, whereas there is no limit for flights.