Who to Contact for Past Invoices and Billing History Gena Ferris December 31, 2019 14:21 Updated You can request past invoices and billing history information by contacting DPL’s accounting department toll free at 1-800-561-8880 or by emailing email@example.com. Related articles Does DPL Offer ACH/EFT Payment Method Options? What is the Monthly Suspend Fee and Unsuspend Cost for Hercules Modems? Which Hercules Modems are Subject to Overages? How Are Monthly Service Fees Billed? How to Suspend and Unsuspend a Hercules Modem Comments 0 comments Please sign in to leave a comment.