Before the Business visa extension.
You must have a workpermit which when filing in the work permit have to wait approximately 14 days to receive a work permit.
The question.
1. What position of work do you do?
2. The last time, I have sent a file for the list detail company document. You have a fully or not?
3. the company has been hiring Thai employees who work at least 4 people is in 3 months?(the minimum salary, 9000 THB)
4. Since the open the company, The company has income or not?
5. The company registered of VAT and Social Security or not?.
I think you should a new Non-B visa will have enough time to prepare the document.