I work in a warehouse, and in this warehouse different positions get paid differently (obviously) - but something happened to me that I'm really confused about.

So, when I started with this company (a refurbishing company) I started through a temp service (everyone starts through temp and gets hired on after some months) as a product tester for pay rate ***x***.
So, fast forward to the point where I am hired on. A few weeks later, I am pulled into the office to discuss being moved departments (to become a computer technician, for pay rate ***y*** which is higher than ***x***). It was discussed my new pay would start after 60 days into the position (The wait was supposedly a waiting period for me to decide if I wanted to stay in the position). Anyways, during this 60 days (Maybe halfway through or so) everyone in the warehouse was gathered and told we would all be receiving wage increases (The wage increase for me would have been ***y***+$1.)

However, now several months later, I still have not received this pay raise because I technically did receive a pay raise after the talk of the warehouse raises. The management held off my signing of paperwork until right after the discussions on the wage changes.

All of the temp workers that are starting in the same position are making the new wage ***y*** before even being hired on.

My questions are as follows:

 1. Should I try to fight for this $1? I know most of it will be taken with taxes anyways, but I'm having a pretty hard time affording things.
 2. Am I being used? Is it time to try to find a new employer?
 3. I'm pretty sure what they are doing is legal, but I wanted to be sure?

Thanks guys.