1. The receipt can also prove that there is a contractual relationship between you, because he took your money for a reason and stamped his official seal, and there is a factual contractual relationship between you. You should file a lawsuit with the other court in the industrial and commercial registration and demand repayment.
If you don't return the goods, you can sue Dayun Express together, because they are jointly and severally liable.
If the contract is performed in your county, you can also sue here. According to the law, the lawsuit should be brought to the court of the defendant's domicile or the place where the contract is performed.