Right now I'm about a week into fighting with support, so far unsuccessfully, to get back $40 in charges for device protection on a device that was deactivated months ago. Their response: "it's your duty to remove device protection when deactivating a device."
This is after more than a year of struggling with WiFi tethering issues. I've had a ton of problems with the hotspot dropping WiFi connections and other weird networking problems where the phone suddenly stops routing traffic correctly (I suspect it's something to do with the network swap). In the ~10 times I've contacted them about the issue, support has been absolutely terrible. They usually take about 30 minutes before they even figure out what tethering is, only to suggest I install OS updates or swap out my phone for the nth time.