I am filing this complaint regarding invoice no. 3000769995, dated 11 July 2024, in the amount of EUR 1,856.62, related to a car rental paid by card. My payment provider (Wise) has provided written confirmation that the EUR 1,856.62 transaction was successfully processed and captured by the merchant, and that there is no unpaid or outstanding balance on my side.
Despite my formal dispute and submission of supporting documents, SIXT only contacted me again in October 2025 and then transferred the matter to a collection agency (eCollect AG), which is now demanding EUR 2,374.24 (invoice amount plus interest/fees) while the principal remains disputed and without proof of any outstanding debt.
Context (prior history):
This is not the first time I have experienced serious billing issues with SIXT. I worked with SIXT for approximately 1.5 years (2023–2024). In a prior dispute where SIXT pursued payment from me, it was ultimately confirmed that SIXT owed us approximately EUR 4,000, not the other way around. This history raises concerns about the accuracy of SIXT’s billing and internal reconciliation processes.
Request/Resolution sought:
1.Immediate withdrawal of the case from eCollect AG and cancellation of any related interest/fees;
2.A written explanation and reconciliation evidence showing how SIXT concluded the invoice was unpaid (including acquirer reference/ARN if applicable).
