PSN Jig ($10)

Head over to https://www.playstation.com/en-us/corporate/contactus/ and go to Live Chat. Type in your info. Click “PS4” and “Other”.
Once in chat, greet the rep and be extremely nice. Make sure to sound very professional throughout your messages. Tell the rep that you recently (anytime within 3 months) bought your son/daughter a PSN pass (any month) and that you're extremely disappointed. Tell them that your child received extremely vulgar messages from other players, he/ your wife/ husband was really upset. Ask if there is any way they can make it right (in your own words). The rep will talk with you for a bit and eventually “transfer you to a higher authority” that deals with compensation.
Once your with the new agent (in the same live chat) continue explaining to him your problem. Make sure to ask for some type of compensation as well. The agent will eventually offer you a $5 PSN code. We are going to get more than that though. Tell the rep you would like a $15 (or say $20, $30, $40, etc so we all don't say the same thing) and would be super grateful if you could get one. The rep will then tell you that the best he can offer is a $10 PSN credit code. Once he gives you the code, thank the rep and exit the Live Chat.