Tail Light Switch problems of the 2005 BMW 3 Series

I received a recall letter from BMW for the problem with rear lamps. At that time,all real lamps were working on my car. However for safety concern, I brought my car to be checked; few months later, one of the tail light not working. I took my car back to the dealer, they said they were done for the recall . I need to pay if I want to fix the problem. But I found there was no positive voltage on the light bulb circuit. I traced the wire and discovered the wire was broken. Then I also found all other wires for the tail lights were aging, the plastic of the wires were deteriorated and the copper wire explored to visible. That mean the dealer didn't do the right work last time. Because it's no reason the wire will deteriorate that fast if they did it right for the recall. I complaint to BMW and the representative said they already done with my car. If I need any work to be done I need to pay by myself. The copper wires explored to visible, it would cause electric fire. This is a safety issue. I have the picture showing the aging wire condition on my car. I can email to you if you need it.

2005 BMW 320i . Tail light indicator warning came on. Turns out the wire was melted around the metal where the wire plugs into tail light!! very expensive to fix!.