What do I need to update my bank profile in Thailand?

Update.... I just attended a bank interview, to update my profile, after asking on the phone for a yellow book and passport. I thought I'd take the time to put people's minds at ease. I told my Thai language support team to go shopping , because sometimes things get lost in the translation. I was asked for my passport then my yellow book. I handed over my passport and gave her a blank stare. She then asked for my driver's licence. Job done, painless. A completely different conversation that was had on the phone. No need for a yellow book at all. Despite the fact that I have one. This is how matters should be handled, not shutting down accounts without explanation.