Lost ipv6 static block

Hello,

Maintenance was recently performed in my area & after it was done, ipv6 PD stopped working completely.  I called in & business support did whatever they did on their end & it didn't fix it.  Sending signals to modem, etc etc..  They then escalated and a tech came out.  He had no idea what ipv6 was and didn't understand anything about ipv6 statics or prefix delegation.  On his internal app the ipv6 block doesn't even show up on my account!  I showed it to him by signing into comcast busines so he called in and nobody he talked to knew what the heck I was asking about.   I asked if he could replace the modem, and he said sure, so he did that.  He reloaded all the settings.  

Prefix delegation is now working.....but my static ipv6 block isn't loaded!!!  I also noticed the lease time went from 4d to 1hr, which I think is a positive improvement, as trafic usually stopped routing after a day and I'd have to kick & ask for another block.

Can someone please tell me how I can get comcast support to assign the ipv6 static ip block back to my cable modem.?

Rob