If the entity is not registered for GST there is no require to include GST in the price (ie. turnover below $75,000) I find this difficult to believe in DWI's case. The GST legislation clearly states Price is GST inclusive Value is GST exclusive. Any international entity operating in Australia require an ABN and is require to lodge statutory return with the ATO on an Annual Basis.
If this entity is not operating with in the Taxation Legislation and anyone is concerned, the entity should be reported to teh ATO. Additionally they should be reported under the Trade Practice Act.
I don't know if this is the case with DWI but this is what anyone if they are really concerned with this entity or any other entity operating outside of the relevant guideline should do.