Customer Service
Client Services
100 N. Rupert Street
Fort Worth, Texas 76107
CustomerService@diamondh.com
Toll Free (888) 332-7110
International (817) 332-6765
Fax (888) 749-8218
International Fax (817) 332-8218
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If you need assistance redeeming an award, or are a current customer seeking assistance, please contact us by email or phone at (888) 332-7110 (7:30 am – 5:00 pm CST).