http://www.studentguardian.co.uk/index.php?option=com_content&view=article&id=558:student-loans-company-helpline&catid=238:helplines-for-students-&Itemid=199

Don't forget the number you ring is the one where you lived when you applied, but there's more about how to contact the Student Loan Company here:  CONTACT STUDENT LOAN COMPANY