Tell me, have you ever read the book of Proverbs?
Have you ever read the book of Proverbs in the bible. It teaches a lot about walking in the wisdom of God. I also see a lot of anger, but I don't suspect it is from one instance only. You have come to a Christian site and I want to help you with your anger and unhappiness. I think there is more to what you are experiencing than this one issue, because I can't comprehend how from one incident you would be angry enough that you would want to call social services on your mother.
Let's talk more slowly about the incident. You love your Xbox. What kind of games do you play on it? I don't know enough about the Xbox. But I just want you for a moment to calmly compare your Xbox to the person's shirt.
Now that shirt on the customer may have been their favorite shirt, who knows it could have been a shirt from a close friend or relative who just died and it is the only thing left that they have from them. We don't know but we are trying to compare that they may love their shirt as much as you love your Xbox. Even though the person didn't notice the ketchup right then, what if when they got home they felt as devastated about their shirt as you do about not having your Xbox. Can you just sympathize for a moment with someone else.
Now you have an Xbox that you love. I don't know but maybe you are devastated because that is your only distraction from loneliness that you have. There is a reason you are so attached to the Xbox. What is it.
Well anyway, don't you think you should have felt bad for the other person since they may have loved their material item as much as you love yours?