Good evening, I have just taken a new job and it is not what was advertised or agreed to. The job was publicly advertised as working a 4-day-on, 4-day-off rotating roster. It was discussed in the interview, and via email exchange. When I arrived, after leaving my previous job, I was told that it is only 3-days-off, not 4 and that I will not receive any extra salary. I feel this is grossly unfair, but where do I stand under Employment Law?