Where can I find a health insurance office for expats in the Bangna area of Thailand?

I'm hoping someone here can help me. I'm looking for health insurance for my partner and me. We are looking to stay long-term. However, we want to go to an actual office and talk to someone who can explain how the health insurances work here. I don't want to do it online. I want face to face discussion. Can anyone recommend an office to go to? I'm in the Bagna area but we are willing to travel a bit.