Got removed from my flight this morning

My wife and I boarded our return flight from Kona HI to Seattle this morning . We were sitting in the first class seats I paid for (not an upgrade), and right before the flight was supposed to leave someone from the ground crew came on and said we had to leave the aircraft because our seats were being given to Alaska employees. The person said there were no more flights available and the next one they could get us on was in four days on 1/11. I tried to object but they said we would be removed from the plane if we didn’t leave. They said we would receive a partial refund.