Verified: 13 March 2026 12:21 pm UK Time
Industry: Retail, Supermarkets & Banking
Jurisdiction: United Kingdom
Primary Regulators: Competition and Markets Authority (CMA) & Financial Conduct Authority (FCA)
Important Safety Warning: Beware of fake customer service numbers on search engines. Only use official channels. Scammers frequently buy ads to promote fraudulent phone numbers. Sainsbury’s staff will never ask for your account PIN, your Nectar password, or ask you to move money to a “safe account” over the phone.
Level 1: Customer Support (Initial Complaint)
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How to complain: You can raise a complaint via their online contact forms, Live Chat, or by calling their dedicated routing numbers based on your issue:
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In-Store Purchases & General: 0800 636 262
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Online Groceries & Deliveries: 0800 328 1700
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Sainsbury’s Bank (Credit Cards/Loans): 0345 266 1660
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Source Verification Note: Sainsbury’s Help & Contact Portal
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Availability: The Online Grocery line operates Monday to Sunday from 8:00 AM to 11:00 PM (UK Time). The General/In-Store line operates Monday to Saturday from 8:00 AM to 8:00 PM, and Sunday from 10:00 AM to 5:00 PM.
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Timeline: Sainsbury’s aims to resolve initial retail complaints within 48 hours.
Level 2: Formal Corporate Escalation (Notice of Dispute)
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Who to contact: If standard customer service cannot resolve the issue, you must formally escalate it in writing. Send a letter detailing your receipt/order number, a timeline of the issue, and your desired resolution. You must explicitly request a “Deadlock Letter” if they refuse your proposed resolution.
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General Retail Complaints Address: Sainsbury’s Executive Office, 33 Holborn, London, EC1N 2HT
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Timeline: Under UK consumer law guidelines, Sainsbury’s has a maximum of 8 weeks to issue a final resolution or a Deadlock Letter.
Level 3: Regulatory Authority (Ombudsman & Financial Routes)
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Authority: Varies strictly by the product you purchased.
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The Reality: Your escalation path depends entirely on the division you are dealing with:
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Sainsbury’s Supermarkets (General Retail): There is no statutory retail ombudsman. If Sainsbury’s refuses to refund you for faulty goods or undelivered groceries, you must contact your bank and claim a breach of contract under Section 75 of the Consumer Credit Act (for credit cards) or request a Chargeback (for debit cards).
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Sainsbury’s Bank: Escalate to the Financial Ombudsman Service (FOS) for a legally binding ruling. (Website: financial-ombudsman.org.uk)
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Timeline (CRITICAL): For Bank disputes, you can only refer your complaint to the FOS after you receive a Deadlock Letter, OR if 8 weeks have passed since your initial formal complaint.
Level 4: Legal Action (Final Step)
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Pre-Litigation: Before commencing legal proceedings, UK legal protocols require you to send a formal “Letter Before Action” (LBA). You must address it to their corporate legal headquarters. (Note: Sainsbury’s Bank is a separate legal entity, but for general retail, use the address below).
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Legal Address (Retail): Legal Department, Sainsbury’s Supermarkets Ltd, 33 Holborn, London, EC1N 2HT
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Court: If the LBA fails and your bank/ombudsman cannot resolve it, you can file a lawsuit. For financial claims up to £10,000 in England and Wales, you can use the Money Claim Online (MCOL) portal to enter the Small Claims Track.
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Source Verification: Make a court claim for money (GOV.UK)
Community Action: Is Sainsbury’s still refusing to refund your missing online grocery delivery or ignoring a Sainsbury’s Bank credit dispute? Reply below (do not share your passwords, full receipt numbers, or PINs), and our community will point you to the right Section 75, FOS, or Small Claims Court templates!