He bought a network enclosure

My son disappointed me once again. He is not a good student and he very often has problems with discipline in school. His only home to become somebody in his life is sport. He is very talented basketball player but again instead of training he prefer to play those stupid video games or surfing on the internet. Anyway last week he was supposed to pay the contribution for basketball team. We gave him the money because we hoped that the sport is his chance for future. Yesterday we got a letter from the team that our son will be expelled from the team because he did not paid the contribution. I was so mad at him and I quickly went to his room to talk with him and to ask him what have he done with the money. He did not even tried to lie to my. He said that he do not want to play stupid basketball and that he bought for the money a network enclosure. I did not want to hear what the network enclosure was but I told him that he must give it back to the shop. And that he must pay the contribution or else I will cut off the internet. I grounded him for two weeks but he gave us the money back. Unfortunately it seems that I will not play basketball anymore. He decided to quit it because as he claims he did not like it after all. I really do not know what he will do in the future but I am worried about him.