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 firstname.lastname@example.org. 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 to Suspend and Unsuspend a Hercules Modem Comments 0 comments Please sign in to leave a comment.