Weird. 60 minutes should suffice being a pure-bred star alliance itin. with luggage checked through to final etc.

In NRT where they have a similar setup (.i.e. also a *A "under one roof" airport) they quote 45 mins minimum for international-international transfers within *A.

http://www.staralliance.com/en/benef...-and-transfer/


http://www.staralliance.es/es/press/narita-prp/

I can see you are having a hard time getting concrete data off TG. I couldn't find anything concrete either.

http://prthaiairways.com/thaiair_4p/...?lg=en&dng=458

My gut feeling is that you need to keep pushing your TA. If this is not urgent and you have time up your sleeve to resolve this you could try

http://www.staralliance.com/en/contacts/