No deposit unless its refundable and ask to see in writting when the rebate is due to terminate.
If they have advertised a price, unless they clearly state how long its available for, they cant just 'end it' adhoc, but your in Qld and I dont know the laws are there relating to advertising.
I hate to say it but years ago Queensland laws allowed the likes of Peter Foster and his Bai Lin Tea scam and another person that sold material on how to to bet on varous racing events and always win.
Of course (not OFF Course) the only winners were the sellers of the material.
Sorry to say this is really a case of 'Caveat Emptor'.
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