End of January: After informing them I won't take any shifts in February as well and am available for any questions ofc., Works tells me I can be put "dormant" until end of march the latest (no fixed contract) and that generally they'd like me to stay.
Today: I get an informal email with my official notice of removal, and a follow-up email by the person from the office who sent out the mail that she didn't know I was getting removed from the roster and best wishes.
I reply with: "Me neither!" + a short, factual comment about the situation.
Think it's time to see if I can land another 'student' job..