Terrible customer relations

I experienced the worst customer relations when checking in for my flight on Tuesday evening. After getting to check in over 1hour 15minutes early for my domestic flight I was told there were 3 broken seats on the plane so I might not fly that night. The British airways staff made 3 of us stand waiting for over an hour telling us our seats were broken so we have to just wait and see, meanwhile there were seats on a mango flight that was flying to the same destination that day. British airways were too cheap to ask mango if it could accommodate the 3 passengers who were all there at check in well before the time with valid tickets for that flight. I am disgusted with the way this situation was handled.