What age are you?

Ang Zhou. I think you've been conned. The immigration office is probably working with the agent. You would have been better off getting an email from your embassy which states they do not issue letters requesting extensions and this would have been accepted. If coming off an STV there is no requirement to extend your insurance. A pal of mine has just done this in the last few weeks in Bangkok

Ang Zhou. You don't need a letter from your embassy. They stopped asking for those a year ago. But look it's ok if you want to throw money away at agent, people do it every day in Thailand. But please please do not start complaining about paying 400 baht to get into a national park when Thai people get in for 50 baht. You've obviously got money to burn!

Garrett Greenwald. It's your choice of course, but totally unnecessary.

Seriously, you pay an agent to get your covid extension? I hope you don't complain about Thailand National Parks double pricing! 🤣

Dror Rahamim. They can leave of course, but they cannot get a re-entry permit on a bogus visa

Neal Marshall. If you got vaccines in Thailand you will have been given a 13 digit number on the certificate after your second shot. You use that to register the Mor Phrom app, which is acceptable for entry to UK (and naturally re-entry to Thailand)

You need to get a re-entry permit for your visa, and apply for the Thailand Pass online.

Terary Apellido. Pretty sound advice.

In Bangkok you'll need to have filed a 90-day report