Recently our Utility Warehouse internet-phone line stopped working.
During the initial phone call to UW (after getting through to the correct dept.) they analysed that the problem was with their line rather than with my phone.
It took them a few days to resolve the problem at their end but my phone was still not working.
They then asked me to send in the voicebox for testing.
Within hours of receipt the box was tested, reconfigured and posted back to us.
Todays phone bill shows a credit for my postage paid.
It was a pleasure to deal with a utility service that managed to handle an issue swiftly and professionally.