EPON provision

I’ve spoken to multiple reps and spent 3-4 hours on the phone where I was hung up with once after 1+ hr and another who connected me with someone else without telling me after 45 minutes only to be then escalated and told a tech needs to come out. I saw another member have similar issues. All I want to do is use my asus BT10 with the ONU, not bridge the XER10 I have as this is not possible. I was told a tech needs to come out and put my modem into bridge mode? Someone please help me!