In most Embassy website, they clearly state the no reason wil be given, if application is rejected, but with all those requests for additional documents for the same reasons, it should give you a clou why.

Why worry about something that may never happend.

You can always apply for a 60 days tourist visa before going, at most embassies it only take a week or 2 for Touristvisa.

Simply only apply online at

And only for 90 days pr. travel in most countries.

Only go to the TDAC page via link from the Thai Embassy in your country, then you will end the right place.

Take control over your future life, and do the application yourself in your own homecountry, where the Embassy would be used to see the type of documents you provide to support your application.

While waiting in the comfort of your home, you save big on, not having to pay for travelling to a 3. country, and pay hotel, restaurant and other costs for the whole duration of the visa processing.

Go to your homecountry, where the bulk of the documents are from, and they know how the documents are formated, for less danger of rejection

Best to apply in the country, where the bulk of the documentation originate from.

Then you also save money to going to, and stay in a 3. country, but can wait fir the visa in the comfort of your home, with no hotel, restaurant bills.

Where did you see payslip in the requirements ?

For volunteering in Thailand you need a work permit and corresponding visa, not DTV.