QOO10 review: defective product no reply from seller

Hi Qoo10,

Would you please help me?

I placed order with seller DAISO with order number 299672567 on 14 July 2019. I received parcel on 22 July 2019 and found that it is defective. Therefore, I contact seller on the next day (23 July 2019) to ask for exchange but I didn't get any response from seller for the next step.
It has been one week since I received the item. The item cost me S$126 (after coupon discount S$111).

Please help me on this matter, to get refund from the seller or exchange another one with me.

Thank you and hope to hear from you soon.