Can you recover a debt without a written contract?

The missing signature is only one question
A landscape contractor agrees a small commercial job by phone after sending a quote. Work starts, materials are delivered and the customer pays a deposit. When the final balance is requested, the customer says there was never a signed contract. The contractor needs to reconstruct what was agreed without turning assumptions or later recollections into invented terms.
Start with the agreement that can be shown
Business.gov.au explains that contracts can be verbal, written or a combination. That does not mean every conversation creates an enforceable agreement, or that every type of work can proceed without required written documents.
Collect the quote, acceptance messages, purchase orders and deposit record. Identify who made the agreement and whether that person acted for themselves or a business. For work subject to specific contracting requirements, have those requirements checked rather than assuming a verbal arrangement is sufficient.
Separate evidence from memory
Write down your recollection while clearly marking it as a recollection. Then place it beside records created at the time: messages, diary entries, delivery dockets, photographs and invoices. Note where the records agree and where there is a gap.
Ask workers to preserve their own contemporaneous records without coaching them into a shared story. A confident account that changes when documents appear can be less useful than an honest account that acknowledges what cannot now be established.
Show how the claimed amount was reached
Explain the scope, price basis, approved additions and payments already received. If a price was never clearly fixed, do not pretend the number on your invoice proves the agreed price. Identify the material supporting your valuation for legal review.
A customer's complaint may concern quality, scope or price rather than the absence of a signature. Ask which point they dispute. Responding to the actual objection can resolve more than repeatedly saying that the work was done.
Choose the next step from the evidence
Have the strength of the claim assessed before spending heavily on recovery. The assessment should identify the party liable, the evidence of agreement, any formal requirements and the documents still needed. A demand should accurately describe your basis for payment.
For future work, turn a verbal discussion into a written confirmation before committing labour or materials. That is useful prevention, but it does not repair the existing file by itself. Keep today's recovery decision focused on the evidence that genuinely exists.
Build a record of the deal that happened
Create a timeline of the quote, acceptance, work and payments.
Preserve original messages and identify any missing terms honestly.
Obtain an assessment of the agreement and amount before choosing formal recovery.
Call CRP today about a debt with incomplete paperwork and coordinating a claim assessment.