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I would keep reminding him that you need the money back. If he does keep running away when you try and find him then maybe text or e-mail him and say that you need the money for the pack of drinks you sold him. If he still hasn’t paid you then I would have a serious talk with him. Next time you see him make sure that it’s the two of you and say to him that you have reminded him several times about the money he’s owed you and that you are getting impatient. Also set him a deadline. Say to him that he needs to pay you back by (set him a date). Be polite but don’t be afraid to be firm with him because sometimes you need to be so they know you are not taking it lightly.

If (after all that) he doesn’t pay you back by the set time you gave him then confront him about it otherwise he might think that you have forgotten about it. If he is still giving you excuses then just walk away.

How much does he owe you? I'm guessing it's not enough to sue him for, but I would annoy him until he paid me back if I were you. Good luck

pester him until he gives it to you and if he doesnt, take back whatever u sold