Sounds exactly like the guy I spoke to except he said use the online form then hung up as I was still speaking lol, lost a customer here I won't use again no need for rudeness especially after holding for 30+mins...
The OUT OF STOCK email you must have had references the sticky Gibbo thread, and gives a direct link to the form to request cancellation. The sticky thread references that very same form; it's the most efficient way they have to deal with these requests as they're being swamped with customer support requests. Why are you calling them to request cancellation?

Apparently I'm 40 in that queue though, dunno where I would've been before.