My local TG office advised me that they'd charge me even more then what TG's website for domestic C tickets quotes. Seems hard to believe as the online prices seem to be full fare, sector by sector added up, just about as expensive as possible.
Anyway, since they wouldn't discuss, I finally booked via TG website 4 days ago.

I got the booking confirmation and could see my itinerary on checkmytrip. But today, the itinerary seems to have disappeared - at least checkmytrip cannot retrieve it anymore. There was never a notification of the e-tickets being issued.
And.. YES, they had my contact in case they'd have a problem issuing the tickets.

I could only get a recorded voice on the TG helpline, (allways in Thai, even if I choose english) and of course no quick reply to my e-mail.

- A price increase
- No more 5% discount for booking online
- Poorer service then before...
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Result:

...almost sounds like TG would really prefer me to cancel my reservation so that I can give NOK-Air a try.