Lost or Stolen Cards Lost/Stolen Debit Cards If you have lost your debit card or believe it may have been stolen, please call 866-839-7484 for assistance. Lost/Stolen Credit Cards If you have lost your credit card or believe it may have been stolen, please call 866-839-7484 for assistance. Identity Theft If you believe you have been a victim of fraud or identity theft, please contact us at (605)367-7070, or text (605)525-6700.