Bridge mode in XER10 Please

Before I signed up for Comcast I specifically asked if I could have the modem in bridge mode and was assured it was possible. Fast forward to yesterday when the service was installed and much to my chagrin, after the XER10 was activated, that option was no longer available in admin, nor in the app, and support can't turn it on remotely either. I have my own firewall and networking at my house and I don't need the double NATing. ZCan someone please get this fixed?