The company made numerous promises but didn't keep them.
That would suggest a quite different scenario. It has been said that if you sign a naff contract don't start bleating about it immediately afterwards. Fair enough. However, if you sign a contract based on certain promises, which are then not forthcoming, then that is a mater of principle, loss of trust, etc. That is quite a different matter and, if true, is akin to fraud: i.e. suckering you into something on false pretences. One should not take that lying down. There has been too much of that by too many airlines for too long. Pilots have been their own worse enemies. Management knows it's really a vocation, not a job, and are tempted to abuse that. But is it true about broken pledges, and how serious/critical and about what were those promises? To strike in protest would suggest something very serious.