The only way you guys will get to draw a line with your company is if you all join the union and speak back to them in a collective voice. And dont complain that your union doesnt work...it doesnt work because you guys don't all join it. Its your own fault. Get yourselves all in the union and then you can start getting some respect and stop your company from malicious rostering. Who know, you may even be able to get yourselves a bidding system then. I am faced with the same problem...everyone where I am complains of a lack of power against the company...but only half the guys are in an association. You gotta have collective voice. Its the only way. Get everyone to vote on a course of action...