Yes — under Article 13 of the Saudi E-Commerce Law, you have the right to cancel (terminate) a contract within seven days of receiving a product or service, even without giving a reason. This is a default cooling-off period that applies unless specific exceptions are met.
However, this right does not apply in all situations. Article 13(2) lists circumstances where the return right can be excluded — for example, if the product was custom-made to your specifications, if it is a perishable item, or if you have already used or opened certain sealed goods. Always check the seller's terms and conditions, though those terms cannot lawfully strip away rights the law grants you.
As a practical tip: keep all order confirmations, receipts, and electronic communications as evidence. If the seller refuses a legitimate return request, you can file a complaint with the Ministry of Commerce, which oversees e-commerce under Article 16.
This is general legal information, not legal advice. For advice on your specific situation, consult a lawyer licensed in Saudi Arabia.