The merchant texted me to pay, but I didn't see it. Can I refund the deposit?

The deposit is a guarantee for both parties to perform the contract and is binding on both parties. As the party paying the down payment, you have breached the contract and failed to fulfill your obligation to pay the final payment. Then the seller can not return it.

If you are not satisfied with the goods you bought, you need to convert the deposit into the amount of the goods after the purchase process is completed, and apply for a refund according to the seven-day unreasonable return service, so that your deposit and the balance can be returned.