Cox Business: Cell backup not working

We have a cradlepoint, which is for cell backup if the hardlined coax goes out. 

We want to simulate the cell backup to test it, so Cox advised us to unscrew the coax cable from the modem.

When we do this the cell backup never kicks in.  No matter what we do we cannot get the cell backup to kick in.

They cannot even figure out how to manually enable the cell backup - automatic switch over would be ideal - but at the very least we need to manually switch to it.

We have had several techs work on it, changed all equipment, submitted several NTT tickets, etc and no one can figure it out.

We are actually having cradlepoint cell backup issues at several locations and none of them can be fixed.

What do we do other than blast out on social media how this service does not work and ask the world for suggestions of what company is better than cox and help everyone get off of cox and onto a service that has a cell backup that works correctly?