1.) the Thai Consulate has been closed for nearly 3 years now (consider it permanently closed); so the Thai Embassy in Canberra has jurisdiction over Melbourne = go to Canberra
2.) you have to do contact the old-fashioned way = go in-person to the Thai Embassy in Canberra
3.) as you have an Australian Convention Travel Document/Titre de Voyage, you need a Thai Visa; and, if experience with Thai Consulates in the USA and using DHS/USCIS Re-Entry Travel Permits and Refugee Travel Documents are anything to go by: since your Australian Convention Travel Document/Titre de Voyage is NOT a passport, the Thai Embassy will most likely issue a Thai Visa Sticker and not a Thai eVisa (even if the Thai Embassy/Consulate is using the Thai eVisa system)
4.) as the Thai Embassy and Thai Consulate in Australia are very new to the Thai eVisa system, clearly it may not be operational in real life yet and not yet issuing Thai eVisas.....
sincerely think the OP has his wires crossed and using the wrong vocabulary and terms:
Thai Customs (ศุลกากร) ?? or American Customs (DHS CBP) ??
OR, do you mean Thai Immigration (ตม) and American CONSULAR Officials (กงสุล) at the U.S. EMBASSY in Bangkok or American CONSULAR Officials (กงสุล) at the U.S. CONSULATE in Chiang Mai ??
Thai Immigration (ตม) at the local (Provincial/จังหวัด) Office or Thai Immigration (ตม) at the Airport or Border Gate (ด่านพรมแดน)
Again, several have already commented that Thai Customs (ศุลกากร) and American Customs (DHS CBP) have nothing to do with passports, visas, immigration, citizenship: thus, probably wrong usage of terms by the OP, but is confusing everyone....
Currently, not all European countries get 30 days Visa Exemption, some even get 90 days, some don't have Visa Exemption, but 15 days Visa on Arrival (VoA) which need to apply for at the port of entry.
Currently, even some Schengen countries need a Thai Visa before traveling to Thailand!
Please kindly specify which particular country one would like to inquire about....
Sawatdee again! If you wouldn't mind, then could you please forward a link to that YouTube video for USCIS Contact Center live help tip/formula, or via DM/private message? If not, then that's okay too! Thank you very much in advance!