Conveyancing Brisbane

The cooling off period provision didn’t enclose within the sales contract of land. However, the agent orally informed the provision and both parties gave consents and signed the contract.

Is the agent’s oral statement a term of the contract and makes the contract valid?

If it is, then is the contract voidable in accordance with Conveyancing Act 1919.

I could not find any court cases in relation to this situation, could someone give me some reference?

The agent forgot to attach the provision in the contract, is this a mistake or negligence in Tort law?

Thanks!