Not to fear, this phone call you recieved is well within the guidelines set down by the NCAA. Division I Hockey is allowed to phone a foreign student who has just finished their sophmore year(10) once during the month of July. They do not need to set up a special list but they must report that they phoned you and talked to you about their interest in you and their programme. This is very good and shows that they are very interested. It must have been exciting, I know the same call to my house was well received when it came.
Keep working hard, it will be worth it in the end.