Hi and welcome. My first response will follow shortly. Please feel free to follow up if anything is not clear.
The requirement for any purchase of land is that it must be in writing, and until the offer was actually accepted by the seller, by signing the document, there is no contract
Clearly this seller is unreliable and has mucked you about, but until his signature is on the contract, there is nothing you can do.
For your reference the Property Law Act says
(1)A contract for the disposition of land is not enforceable by action unless—
(a)the contract is in writing or its terms are recorded in writing; and
(b)the contract or written record is signed by the party against whom the contract is sought to be enforced.
(2)In this section, disposition does not include—
(a)a short-term lease; or
(b)a sale of land by order of a court or through the Registrar.
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