please contact our sales representative for a RMA form, we’ll proceed accordingly, this was for official big loss on your side.
For most of the time, we will send replacement to you with your next order if you can send us pictures of the defective units. no need to send us defective ones for most of the time.
In case there is abuse of our sincerity, we will ask you to send us back the defective units yearly or quarterly.
In case that you don’t need any more of our products, we will refund in full within 3 days after the arrive of the defective units.