The vacuum handpiece cannot be added separately to the 3-in-1 machine because the main unit does not include the required vacuum pump and connection. If your order was delivered within the last 30 days, you may contact [service@freyara.com](mailto:service@freyara.com) with your order number to request a return or exchange for the 4-in-1 model. Our after-sales team will review the condition of the machine and provide the return instructions. Return shipping costs may apply.