What should I do if my Non-B visa and work permit expire and my employer won't renew my contract?

A user is seeking advice regarding their Non-B visa and work permit expiration, which are both set to expire on September 30. The employer has not renewed the contract, leading to a situation where immigration authorities won't allow an extension. The user is asking for recommendations on whether they need to exit Thailand, where they should go, and what the associated costs would be.