@Rob ******
this happened to me recently. Got this woman who just kept aggressively having a go at me and wouldn’t listen to me speak. She then started telling me what her version of a holiday is. I had all the proof to show my travel details, onward flight back home (which was 3 weeks away), live bank account amounts etc. This was the first 30 day stamp I’d had in maybe 8 years, and only one in current passport. Normally on visas but decided to go to Vietnam for a short stay instead of extending. Seems there’s a crack down at the moment- which contradicts the Thai tourism line of wanting to attract more tourists to bring in money…