Wait a cable broke and they charged you 20 bucks? WTF boa gives shops free parts kits. Seriously sorry you got ass raped on a fucking cable, a knob I would understand. I snapped a knob off in the outback of Keystone when I fell off a rock drop and tumbled through a rock field. Best advice I can give you is contact boa and get a spare cable you keep in your wallet. I carry that and a tool in there at all times.
^^ What he said - incidentally the same as what I said previously.