Aspire Resources Inc. was originally created as ISL Service Corp. in 2001 as a wholly owned, for-profit subsidiary of Iowa Student Loan to perform functions not specifically included in our parent company's original tax-exempt designation.. For concerns and queries with regard to Iowa Student Loan, concerned parties may adhere to give customer service contact numbers, to be able to get their problems resolved in an expedited manner. By Mail: General Correspondence and Forms P.O. Box 659703 West Des Moines, IA 50265-0970 Corporate Office Phone Number: (855) 811-9849  Private Loan General Questions: (844) 268-2203  Private Loan Application Support: (800) 542-6005  Fax: (515) 471-3996. Credit Dispute Mailing Address: Credit Department Aspire Servicing Center P.O. Box 659705 West Des Moines, IA 50265-0970 Student Loan Advocate Federal Student Loan Ombudsman The U.S. Department of Education’s Office of Student Financial Assistance has created the Student Loan Ombudsman’s of