From Philippines.. if you a have a letter of employment and company registration doc.. from a Thai company they will issue 3 months Non B. You can extend for another year and so on. Done it in the past for a family member.
If ur work permit expired...they charge 500 baht a day.. from the date of expiry to the date u apply for renewal .. u should renew the work permit at least 2 months before the expiry date..