Check the serial no of the device and call the customer care and explain your problem if they wont help file a court case against then in the consumer court

Customer Service

• Support
  For technical help and answers to questions about products, visit Support.
  
  
• Warranty Information
  Kensington guarantees customer satisfaction. For help with a malfunctioning product or for replacement components, please contact a representative by e-mail.
  
  
• Rebate Questions
  Rebate payments are issued within 8 weeks of valid rebate submission receipt. If your are inquiring about a 2009 rebate please inquire using: rebateshq.com web site. If you are inquiring about a rebate from 2008, please contact Kensington Rebate Customer service at 1-866-469-9313 or via email at [email protected].
  
  
• Money Back Guarantee
  To return a Kensington product under our 90-Day Money Back Guarantee (valid in the US only) please complete this form and mail with the product being returned. Allow six weeks for response.
  
  
• Online Store
  For questions about orders placed online, click here for Customer Service.
  
  
• Material Safety target="_blank">MSDS are referenced by model number or the name of the cleaning product. For sheets on products not listed, contact a representative by e-mail.
  
  
• Computer Resellers
  A site featuring exclusive promotions, sales tools, product information, incentives...
  
  
• Contact Customer Service In North America
  800-235-6708 phone
  650-577-0595 fax
  Monday - Friday, 8am - 5pm Pacific Standard Time
  Contact a representative by e-mail.
  
  
• Outside North America
  650-572-2700 phone
  Monday - Friday, 8am - 5pm Pacific Standard Time