<human>: Here's the background information: I am an expedite at a popular restaurant making $11/hr. I'm 20 years and a student. This is a pretty good job to me and I kinda enjoy the hectic kitchen work. Although, my GM is a bit of a dick face that almost everyone strongly dislikes him.

I studied abroad this summer in Prague and took a hiatus or LOA from my job for just over two months. I gave notice to my managers about six months ahead of time (in January) that I will gone for the summer. I filled out a schedule request and submitted. Everything was done to their regulations. Now he's the weird part... Now that I'm coming back into work, I was told by the GM and another manager that I was taken out of the "system". They transferred to an online schedule system that they use now. Now my GM wants to start me at a lower pay, cutting my pay for taking an educational leave.. Let this be known that I consider myself a good employee that always works hard, comes in on time, I don't bitch and usually respectful. I don't see how my GM can justify giving me a pay cut.. Is this right? Should I straight out call HR and chat with them? I told my kitchen manager that if they give me a pay cut, I will immediately quit. My KM thinks I have talent working in the kitchen and definitely doesn't want to lose me. Is this OK or unethical business practice?

Give me a shortened version of the text
<bot>: Took an LOA from work this summer, to study abroad, and now I'm back and my boss wants to cut my pay. WTF