Hi, we feel sorry to read about the issue you encountered. Could you please explain the situation a little bit? If the drone is lost, please report a flyaway case in our system, we will help you further.
Please fill out the information here https://repair.dji.com/repair/flyaway-apply or contact our support at http://www.dji.com/support to start a case.
If the drone is not lost, the issue is that the drone can not be connected to the controller, please try to relink the drone and controller. Please keep us updated.