I too found them perhaps a bit over efficient! Called them a few months ago as my Acer netbook which was in warranty died and wouldn't boot. After getting me to try a few things they agreed they would need to have someone call with me within a couple of days to collect it. Later that night I found a likely solution online and downloaded files to a pen drive which successfuly reset the Bios and all was fine again.
I called them first thing the next morning to cancel the service call however the following day, some poor sod who had driven 40 miles from their agents in Northern Ireland came to the door to collect it. He wasn't too put out as he said Acer hadn't cancelled the call with him so he would be billing them for it, however it showed the customer service was there.