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You should contact your union. If they do not assist, you should really go and speak with a lawyer. I do not know what your employer is trying to do, but the first thing that needs to be rectified is wages from 2006/07. The longer you leave it, the harder it will be to explain why you took so long to do somthing about it. Also, I would be asking about training on the new software program. As long as you are not trained, they can push you out of the loop. Again, raise this issue with your Union.
You could consider raising ALL of your suspicions with your Manager and when he says nothing going on, push him on that, ask him abou the CV and why your job has been changed, etc. Do not just let this situation unfold without you having any control.