Hello Cheryl,
Thank you for reaching Microsoft Community. I'm sorry to hear about what happened to the mouse and dongle (USB receiver). The mouse or keyboards operate only through the USB dongle which is uniquely paired. Dongles are uniquely and securely bound or programmed to the mouse or the keyboard and are sold as a matched set. Because of the secure binding or programming, we are unable to provide a replacement dongle that would work with the mouse or keyboard. Lost dongle is not covered by the Standard Manufacturer's Warranty also.
Kind regards,
Roy