Third row seat doesn't go down as it is supposed t...

Third row seat doesn't go down as it is supposed to (meaning seat get stuck in up position). Therefore unusable unless I am willing to have the third row up all the time. Land Rover has offered no explanation for problem nor time frame to fix. Also, navigation system (via inControl app) does not work as advertised. Transmission on vehicle very clunky, especially when engine down shifts.