UPDATE: it turns out that the reason I did not hear from Kartunes is that the Honda dealer gave them the wrong number.
James was finally able to get a hold of me and made plans to fix my stereo system. We made an appointment and he got it done. That is outstanding service. I'm just sorry that he and Kartunes got the blame for something that was clearly the fault of someone else.
After several months of my system working only intermittently at best, I called the Honda dealership, (Bell Honda), only to be told that their contractor was busy but would call me and come to my house to repair it. That was three weeks ago. Bell Honda has forgotten all about me, and Kartunes apparently no longer cares about the shoddy work they performed. Never again.