RSS,
I'll give you a grown up answer - can you respond in a grown up way or will it be donkey pictures? I challenge you...
At our similar company (orange) we have similar managers to you. Disrespect for contracts and fairness at times, especially when it suits them.
When they turn to us and just take something away - either from all or a select group - then the union has power to say "no". And they do. And when the company says "tough, we shall do what we like", then the union serves a writ and the company has to back down.
Balpa are far from perfect, and I'd rather pay them less than I do. But they provide the legal glue that allows us to be heard, and it mostly works. And it has certainly left us in a better position financially.
You are promoting the opposite - the continuation of the situation where you can be picked off either individually or as a group. Why?
Prove you do have some balls by responding in a reasoned way.