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ArchiveAugust 3, 2026Mastermind
Case File · Audit · No. 038

Daily Casefile · Audit

The Billing Dispute at Velo Narváez

9 min

Velo Narváez is Seville's municipal bike-share scheme, operated under a franchise agreement that sets fixed unit rates for dock maintenance and rebalancing visits. DockTech Ibérica S.L. has submitted its July 2026 billing statement to the Seville Urban Mobility Office, claiming reimbursement for maintenance callouts, sensor replacements, and rebalancing labour at seven docking stations. The Urban Mobility Office has referred the billing to an independent auditor after a contract officer flagged a possible rate discrepancy on one of the callout lines. Your task is to examine the six billed line items against the supporting records and identify the single line whose claimed cost cannot be reconciled with the governing rate schedule.

The scene

Velo Narváez public bike-share scheme, Seville, Spain, present day

Source documents

  • Velo Narváez Franchise Operations Contract — Rate Schedule Annex, Revision 4 (effective 1 January 2026)
  • DockTech Ibérica Field Operations Log — July 2026 (extract)
  • Velodyne Mobility Components — Delivery Invoice INV-ES-2026-0714
  • Urban Mobility Office Independent Site Survey — NV-15 and NV-19, conducted 29 July 2026

Play today’s Audit.

This case first aired on August 3, 2026. A fresh audit runs every morning — same rules, five minutes, one solution.