I think you have a problem that will not have a happy ending as it sounds as though your deposit has been paid to someone other than who is now on the contract.
What do you know about the original builder.
Are they a substantial operation?
What other homes have they built?
Who has the deposit?
Is the original builder trying to be helpful or does not want to know you.
Do you know anyone who had dealt with the original builder.
It seems strange that it took so long for the builder to realise there could be a problem building in NSW .
A professional would be aware one could think
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