tmobile home internet speed issues

I was "invited" to try this service because it was now supposedly in my area.  I explained to the T-Mobile "expert" that we do not receive cellular signals at our home thus have to use a cellspot/repeater to convert our Internet service into a 4G signal that let's us get reliable voice service as wifi calling was really bad.  The "expert" talked me into trying this service because she indicated it used a special frequency of 5ghz service that our phones cannot use.  I'm seeing that this was a complete lie and am now in customer service nightmare back and forth between T-Mobile support and the Home Internet Team support.  Frankly, the support I have received has been unacceptable and I have been bounced around the two support teams trying to return the equipment and get the line added to my account taken off.  T-Mobile should be embarrased by this service.  I've returned the equipment but the line is still on my account.  I've had enough frustration that I'm considering dropping all of my T-Mobile services and switching to AT&T!  If you are considering this service I would recommend that you re-consider as the service is worse than any of the ISPs I have ever dealt with.