Explain it to us that still don’t understand. How were you dishonest? Did you break it yourself? Did you lie about it not working properly? Did they take it from you and you snuck it back into your schoolbag? Explain how it’s all about you and not about the person who gave you the new unit.
You seem pretty sure you have all these answers and are arguing with us when you haven’t given anyone at all any reason to think you did anything wrong. Let me tell you something from several of your lifetimes of experience: you will sometimes be treated with gross unfairness in life and you will sometimes receive unearned benefits.
Go to reconciliation, as someone advised, since you have your mind made up and nothing anyone took the time or trouble to say to you here, seems to make a dent. I suggest you go to the priest first in future with these issues and save time. Have a lovely day.