After receiving the payment, I prepared the goods the next day and sent them out on the sixth day. Due to the trade tariff war between China and the US, the goods can only be sent by sea. The customer has also agreed to this. He said I was delaying. Please tell me where the delay occurred. The customer made a mistake by getting the wrong model of the excavator, and thus purchased the wrong parts. However, he asked me to compensate for one. I don't agree. He deliberately gave a bad rating. I said he should buy a new one that's correct. I offered him a discount, but he didn't agree.