How can I obtain a non-B Thai visa for teaching in Cambodia, and which agents can assist with the documentation?

The post seeks direct assistance from individuals who have successfully obtained a non-B Thai visa (for teachers) in Cambodia, particularly looking for recommendations for agencies that can help with document preparation. Comments indicate that while there are professional agents available, they can be costly. Additionally, it is mentioned that if the school can provide the necessary documents, the visa can potentially be processed directly through immigration without external assistance.