The builder says a transfer failed: establish the reason before a retry

Repeating the instruction may repeat the failure
The builder says its transfer failed and offers to send it again. Before asking for another attempt, find out what the payer's bank actually reported. An incorrect instruction, a processing issue and an unresolved transaction need different attention. Do not assume the word failed means the original payment is definitively cancelled or that copying the same instruction will solve the problem.
Ask the payer to investigate the actual status
Request the relevant transaction reference and the limited information explaining the reported failure. The payer should raise the issue with its bank through the proper channel. Avoid guessing the reason from a screenshot or interpreting an unfamiliar banking message as a final answer. If your own account shows an unexplained entry, ask your bank to clarify that separately.
Keep both attempts identifiable
Business.gov.au includes bank records in its record-keeping guidance. Retain the reference and status of the original instruction before recording a retry. Do not merge two attempts into one unexplained receipt entry. A clear trail is useful if the original transaction later needs further investigation or if the incoming amount differs from what the builder says it resent.
Source: business.gov.au: Record keeping
Correct the actual error through a trusted channel
Imagine a hypothetical builder discovering that an account number was entered incorrectly. The parties should verify the correct details independently and ask the bank about the original transaction's status before the appropriate next step. The example does not establish how any bank will handle that error or guarantee recovery of a misdirected payment. The factual cause must guide the response.
Avoid an improvised refund cycle
If a second transfer is made, identify it separately and reconcile actual receipts. If someone then claims a duplicate and asks for money sent elsewhere, check with your bank and adviser before acting. Do not forward funds to an unfamiliar destination merely to tidy the builder's explanation. Any genuine correction should follow verified facts and the appropriate banking process.
Return to debt recovery if no cause is established
Record who is investigating, what answer is outstanding and when the position will be checked. Keep formal recovery timing under review with advice. Repeated failed-transfer explanations without supported progress should not indefinitely postpone a decision about the unpaid account. The useful outcome is a corrected, traceable payment process, not an endless series of identical retries.