1. Negotiate with the supermarket: negotiate with the supermarket manager to buy bad fruit, explain the quality problems of the fruit, and ask for a return or exchange.
2. Find out the purchase record: since there is no invoice, you need to provide the purchase record to prove the purchase time, product name, quantity and other information. The purchase records can be shopping receipts, electronic payment vouchers, supermarket purchase records, etc.
3. Keep relevant evidence: During the negotiation, you must keep the purchase records and photos or videos of bad fruits for use in case of disputes.
4. Complain to the consumer protection department: If the supermarket refuses to return the goods, you can complain to the local consumer protection department for help and solutions.