Urgent help needed 🙏

My mother's Non-O visa (dependent on my father’s 2-year Non-B visa) is about to expire in 2 weeks. Since my parents just got separated, we’re trying to transfer her dependency to my Non-B visa (1-year for a foreign teacher).

Here's where we’re stuck:

1. Her visa is issued in a different province.

2. The officer in my city says she needs to cancel her current visa before we can apply for a new one.

3. The officer in her city says we need a cancellation letter from the BOI (Board of Investment) before they’ll stamp the cancellation on her passport.

4. We went to my father’s company to get this letter, but both my father and the staff refused to help.

Has anyone dealt with a similar situation? Or does anyone have advice on alternative solutions to help us get her a new Non-O visa? 🙏