Legal analysis: no refund. The seller and the buyer sign a written contract, which can ensure that the transaction between the two parties can be carried out within the standard time, and avoid any disputes in the process of buying and selling, which will affect the cooperation between the two parties. Then, if there is no written sales contract, the oral contract is still valid. Both parties shall perform their respective obligations in accordance with the contract. Failure to sign a contract does not affect the validity of the contract. Both parties are bound by the contract and may not terminate the contract at will.

Legal basis: Article 469 of the Civil Code of People's Republic of China (PRC), the parties may conclude a contract in written form, orally or in other forms. Written form refers to contracts, letters, telegrams, telexes, faxes and other forms that can tangibly express the contents contained. A data message that can tangibly express its content through electronic data interchange, e-mail, etc. , and can be retrieved at any time, are considered in writing.