Service representative did not not show for scheduled appt. on Thursday, July 22. Appt. was made, Sunday July 18, when we were advised that a repair representative would be here between 8 am and 4 pm, and call when en-route. In calls to DTE HPP customer service, the appointment was con- firmed, but no one knew why the repair person did not show up or call. I asked to speak with dispatch, a supervisor, or the repair person, to understand the "no show, " and reschedule. I was not allowed to speak with any of the aforementioned. I requested that the service representative note my call as "advance notification, " of "special circumstances, " for reimbursement, (if I can schedule an authorized plumber). I was advised that DTE HPP is not authorizing reimbursements. So, DTE HPP not only has failed to show up for scheduled repair, but is now, unwilling to reimburse the same amount, if I can find a plumber that will show up.