Ye Olde IPv6 /60 Prefix Request

Like many others over the years, I've been trying to set up IPv6 with a /60 (or, dare I dream, a /56?) prefix. No matter what I've done, it's always /64. I've tried asking live chat and they can never answer. [Edited: "Language"], even talked to a retail employee some time back and he'd been trying to get it on his own service and got an internal runaround.

All I want is a /60 prefix, the way It's Supposed To Be. That's it. How do I make this happen?

There's 128 bits in an IPv6. Quit being stingy with four of them.