I would like to meet this 'dad' that threatens kids/young adults legally. The father has ZERO intention of getting a lawyer involved over a few hundred dollar transaction over his son's speaker. He is trying to scare you. And frankly, that's fuccing pathetic of him. Yes Id surely like to meet this dad. Now you know where your 'friend' gets his winning personality from.
Stonewall them, they will go away. You got screwed already, dont let that coward father scare you into getting screwed even harder.