Unfair credit offer to a high school child

I'm writing this message with tears in my eyes because a consultant in sportscene Eastgate miss informed my son to join them and give him a card and some socks and wipes. When I send him to cancel they told him lies that he can't and that time he is not receing any income he is just a student. They have started calling him and threatening him that he owes them and needs to settle them. Oh lord how can you take advantage of children that's unfair consumer debts. When we went to Eastgate one of the consultant it's a guy he was so rude blmkng my child. Seriously will you blame someone who is still in high school not knowing anything about credit. Pls check this. I want my refund back because they said they have charged my child for not answering calls when they call him to spend and has already a debt. Which I fail to understand how. This is unfair.