Unfortunately the realisation of the need for good customer service hasn't yet made it into the aftermarket automotive industry in Australia. Someone will eventually do it incredibly well and will put most of the other equivalent companies out of business because of it. I think that the cause of this issue is because many of these people think they are the only experts around, and in some cases, they actually aren't experts at all!
It's mostly arrogance. I'm sure they will start to wonder what is going on as more and more people buy parts from overseas, and the local guys will start to wonder why they can't pay their bills.