Sales are final once the calling card pins are issued to customers. TeleWizard Corporation will only accept calling card pins with full credit amount for returns or credit if there is a problem with the issued calling card pin. Although we will strive to deal with top quality products, we will not assume any liability on variability on quality of calls and changes in calling rates. We will not accept any phone card pins for return 30 days after invoice date. All returned checks are subject to $25 fee. It's your responsibility to rotate stock to avoid expired card pins.