If the buttons on the case are working but the buttons on the remote don't then it's clearly a fault with the remote.
Each button in the remote is made out of 2 wires on the electronics board that are joined by a small patch of conductive paint situated on the rear of the rubber button. If something gets in there, like water or dirt or the patch flakes out, the contact is no longer made and the button no longer works. The remote will have to be dismantled by popping the clips on the periphery with a sharp tool, the rubber strip holding the buttons will have to be washed and the board wiped clean. If the buttons still don't work after that then the remote is dead, you will have to get another one.
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