union fees

I've been working at ups for about half a year now and was told that I had to pay into the union to join,I thought no big deal, find out it's 500 dollars to pay, it hurts my poor pay check, but I still pay it. Now in the brand new year I'm getting another fee of initiation and the union due at...

so, I know I filled out the paper to join the Union. I was told that by joining they take "Union Fees" from your paycheck, but when I look at the pay stubs, I do not see anything indicating that. Also, I was told the by joining he Union, around the your first year, you would get free benefits...