Obi, tmobile and att booster help

Yes i know that the cell booster is only LTE I have tried so many things including googling and trying to change stuff in my orbi system..

tmobile blocked my att cell booster or femcell and now i have missed so many calls and vm on my cell phone and now also we will get vm hours if not a day or so later  the att device we had full bars on our cell and ipads and not once did i miss a call or vm tmobile is blaming att and att is blaming tmobile. But the conversations i have with tforce in messenger they even stated to me that they basically disable my cell booster or fermcell 

i have asked them why and they said to fill in the gaps.. my mother is in the rehab place and if i miss a call from them if anything was to happen boy i will be highly peed off.

why would it work great for 2 month since i got my tmobile gateway and then poof they disable it.. is there anything i can do i have tried everything

Melissa