Just stop ranting for a second and LISTEN to what people are trying to tell you.

The seat is BROKEN. Ie it will not recline properly or will have inoperable IFE.

The seat has been REMOVED from revenue inventory.

So many defective seats at the moment.
The A380 fleet alone has an average of 15 CW seats marked as defective and not to be used for revenge passenger use on any given aircraft. That means some aircraft will have more than 15 defective CW seats.

It doesn't stop BA giving the sest to a staff or nonrev passenger travelling on standby wholl need to sit bolt upright for the flight duration or be sat in silence because their IFE doesn't work. Or both. So long as the seatbelt works and can remain in the take off/landing position it's still fit from a CAA perspective for someone to sit there.

SIT there. Not lay there, not watch or listen from there.

Why the feeling you're being cheated out of something? As a GCH would you honestly prefer to still take that originally assigned seat despite the defects or would you prefer BA proactivity do something about it by moving you to a seat that does work?

If you feel so strongly, ask the CSM what the deal is and let them set you straight. Even then I suspect you'll still be smelling a rat or something fishy.
​​​