They should have records of who the calls came from though, right?
It's interesting as time has gone by that now people are starting to speak of an accomplice to still hold on to the belief that he did it. (not saying you, but some are suggesting it).
I have offered 2 possibilities and neither involves an accomplish. 1- an automated mechanical device that depresses the redial button. 2- a monitoring system that has a delayed voice dial to a user programmed phone, the monitoring system could be triggered by a power outage.
In both cases there would be a TWC record indicating a voice call was made from home phone.