What is the best way to get help with a Windows Store issue? After buying a new phone, one of my apps won't install, returning an error code 80004005. This appears to be an issue when a previously-free app goes paid, as is the case with the app in question Unofficial Samsung Remote.

From my phone, the app displays as "owned", but errors on install. From windowsphone.com, the app displays as being able to purchase for $1.20.