CUSTOMER SERVICE IS A JOKE

So I have a question on how my unemployed 18yo got a phone on credit. I send a mail to customer service, get a number , get a mail that the log has been closed and a mail to "rate the service" I received. I never had any!. So still no answers. I posted a complain before and the feedback is that they cannot get hold of me. Utterly bs. I am always available and the only time not is when I am on another call. It would rather seem that I am asking uncomfortable questions.. i CANNOT UNDERSTAND HOW THEY COULD HAVE TRIED CALLING ME AS i NOWHERE GAVE MY NUMBER ANYWAY.