If there is any PCB quality problem, or not satisfied with our service, please send an email to service@pcbbuy.com, you’ll get reply within 24hours. If any PCB defects, please provide pictures of the product problem, then we will check it, If the quality problem is indeed caused by PCBBuy, we will repair or re-make your PCB, or refund the corresponding amount to your PCBBuy account for future orders.