I used trunk to get my coe. Yes you have to pay a fee. But I got mine no problom and even had to change dates. Which Trunk did ! So....for less stress I'd recommend going through Trunk
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.