Swearing fine

About half a year ago my parents thought they were clever and made a rule that when ever I swear I have to pay them 1e, and the other way around. Later they said that when they are watching icehockey the rule doesn't apply. Still they owe me about 40e. So far they have paid only a few euros. Last week they bought me this piggy bank where I can put all the money. If I get any.