What are the grounds upon which the court relies to rule for the rescission of the contract and obligate the defaulting party to return what they received, in the event of a proven material breach of contract and the other party's non-response to the claim?

The court relies in its judgment for the rescission of the contract and obligating the defaulting party to return what they received on several grounds, including: considering the non-appearance of the defendant or their failure to submit a response despite being duly notified as a default (نكول) and a presumption of the validity of the claim, the proven payment of the full price by the other party, and the defaulting party's failure to deliver the sold item for a long period, which constitutes a material breach of the contract's obligations, all based on the principles of contractual fulfillment and conditions.