How to Get IPv6?

I just contacted customer support to see about getting IPv6 activated on my service.

I got the strange answer of "we're not allowed to change IPv6 settings" and a modem reboot.

I have a SMC D3G gateway and can access the web interface.

Appreciate any advice on proceeding, feel like Comcast customer service is a dead end on this.

(Aside: there also seems to be no way to open a ticket on the business.comcast.com website that might get routed to someone knowledgeable, have to call).