I was charged 206750 TBHT for DONE4 - no surcharge for Visa/MC.
I had made reservation with QF Premium Desk and Anant took it over and issued. He had trouble at first (not sure why) and was trying to get QF BKK to issue (who wouldn't without credit card holder being present) but we sorted that out.
Note - Anant seemed to also be more accurate in calculating taxes (eg I am transiting LHR only and not wanting to pay LHR departure taxes) - other agencies were a lot more blase about the taxes and calculated them too high.