1.
Shame them in front of their social circle / the whole class. EG Say in a loud voice so everyone can hear "Hey Charlie, you know that £20 you promised me for that meal at (insert name of place)??? So you've got that £20 now?... No?! Come on Charlie I'm disappointed. You promised!!! I'll come home with you after school today, so we can settle things? OK?" Rinse and repeat till they pay up.
2.
Arrange to go to another restaurant with them. Eat and drink £60 worth. Even if you have to bring your kid brother if it's a cheapo place. At the end of the meal declare "It's your turn to pay guys. I paid last time."
3.
Go to their home and demand the money, plus your travel expenses, plus the value of your time to travel there as payment from their parents (something in the region of £40). Explaining how disappointed you are by their broken promise.
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Mum makes a big deal about me having locked my phoneLast reply 1 month ago
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