What are reliable contacts or services for safe entry back to Thailand after a Non-B work visa?

A user is seeking recommendations for reliable contacts or services regarding safe entry back into Thailand after their Non-B work visa expired. Several comments provide advice on obtaining a tourist visa in Vietnam, ensuring compliance with immigration regulations, and confirming the cancellation of the work visa before re-entry. Specific mentions include a service offered by a group owner, a visa agent (Thai Visa Centre), and suggestions on necessary documentation for re-entry.