I come back to the game a little bit later and upgrade a card without even thinking about it. The offer gave me 2855 coins, I'm currently at 2378.
I'm worried that I will get punished because of this. What should I do?
EDIT: I've grinded back to the amount of coins I was given. I hope that works...
EDIT 2: I just remembered that you have to use materials for upgrading as well... And I can't remember if any were neutral materials... I am so worried right now...