loaf413's journey

I have been working casually at a local retail store for about four years, starting when I was in high school. Recently, after a new manager took over, my scheduling changed dramatically. Despite clearly communicating my unavailability for night shifts multiple times, I found myself scheduled for them anyway. Initially, I managed to get one daytime shift each weekend, but eventually, I was only offered night shifts. After submitting strict unavailability times, I didn’t receive any shifts for three months and had no communication from management during that time. Today, I received an email from management asking how I want my roster now that 'I’m back' and requesting a meeting. This left me confused because I didn’t go anywhere; I had set boundaries that were ignored. I feel it’s time to resign, but I’m unsure how to respond to their email without being overly polite or too harsh. I want to express my frustration about the lack of communication and the way my availability was disregarded, but I also want to keep it professional. I’m looking for advice on how to draft my resignation email.