Ask to return something when you can't find the receipt

Help me ask to return something without a receipt.

Item: [what]
Where bought: [shop or site, rough date]
Proof I still have: [bank statement line, order email, loyalty account, photo of tag]
Reason for return: [faulty, wrong size, unwanted gift]
What I want: [refund, exchange, credit note]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. A polite request that lists the proof I do have.
2. A fallback ask (exchange or credit) if they won't refund.
3. What to try next (manufacturer, card issuer, online account).
4. When to check Citizens Advice instead of guessing my rights.

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, figures or products. UK English.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.