Bank complaint in Spain: SAC route and documents
If a bank in Spain does not resolve your complaint informally, the next step is a formal written complaint to the bank Customer Service. Customer Service must reply within one month; for payment-service complaints, the special deadline is 15 working days. Without this step, the central bank will not accept your case.
Quick answer
- Customer Service complaint: written, to the bank Customer Service. The formal gateway before escalation.
- Response deadline: one month for the Customer Service reply; 15 working days for payment-service complaints.
- If Customer Service refuses or does not reply: escalate to Banco de España.
- Banco de España is free and independent but requires a prior Customer Service complaint.
Tell us more about the bank problem
NAVI will prepare the right complaint.
Prepare your Customer Service bank complaint
NAVI will draft a clear written Customer Service complaint with your issue, evidence and demand.
Prepare SAC complaintWhat to include in a Customer Service complaint
- Your full name, account number and ID number.
- Clear description of the issue: what happened, when, amounts involved.
- Documents: bank statements, correspondence, screenshots, payment proofs.
- Your specific demand: reversal of charge, explanation of block, return of funds.
- Dates: when the problem started, prior verbal or informal contacts.
What to do first
- Write the Customer Service complaint in writing. Not just a call or branch visit.
- Send via email with read receipt, through online banking, or by recorded letter.
- Keep the submission confirmation. This is the proof that triggers the Customer Service deadline.
- If Customer Service refuses or misses the applicable deadline: file with Banco de España.
Documents and evidence
- Bank messages, screenshots and access errors.
- KYC requests, documents sent and delivery proof.
- Account contract, statements and proof of origin of funds.
Deadlines and risk
- Verbal complaint only: no formal record, Customer Service deadline does not start running.
- No proof of sending the Customer Service complaint: Banco de España requires evidence it was filed.
- Customer Service complaint without specific demand: the bank can acknowledge and do nothing.
- Going to Banco de España without prior Customer Service complaint: the case will be returned.
- Missing the Banco de España format requirements: delays the case review.
Customer Service refused or no reply within the deadline?
Tell NAVI. Get the Banco de España complaint ready with the right documents.
Escalate to Banco de EspañaRelated pages
Information only, not legal advice. Public authorities, courts, banks and companies make their own decisions.
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