

None of them can be saved? That seems statistically unlikely.
But back up a bit, that comment I made is a general truth, it doesn’t just apply to this situation. When someone is wrong, you correct them, that’s generally just the right course of action.

You should consider taking it apart and seeing how the buttons work, things like how large the spring is, what the actual electrical contact mechanism looks like, if there are guide tracks on the side of the button that allow it to press down evenly instead of tilting to one side or jamming.
If you know how it works, then even if you don’t find the exact same part from the exact same manufacturer, you’ll still be able to find something that works the same way and feels just the same, you may even find it cheaper or locally.
I’m a strong proponent of taking things apart.