I had ordered DJI naza m lite GPS module flight controller for quadcopter and a s500 frame from hobby King. The customs held the parcel , when I called them they are asking for a NOC from the WPC . I explained them that the parcel doesn't include any kind of transmitter or receiver but the talked rudely and said wouldn't release the parcel if I don't show them the noc . Is it needed ,I can't understand what to do.