I think you are handling this very well, I would have already contacted his local law enforcement. There is no excuse for lying to a customer unless you just don't give a shit. Take Matt from socal suspension, he is very very very very sick but still got everyone's stuff back and STILL finds time to come on the forum. His excuse is he is moving? To fucking Alaska or something?
I run the 10.4mm on my truck, they are great wires but dont let them get to hot! I would suggest just getting a dyna coil, the wires just pug into terminals on the coil. They run the same terminals as most cars/truck so this makes it very easy to replace wires if something would happen to them.
Tayler wires
I sure hope he has a good excuse. Like his shop or house burned down, went to prison, got paralyzed, got a job as a assassin, got robbed, got put into witness protection, or something along those lines.