5G internet Fast and Reliable When!?

I have been paying for 5g home internet with t-Mobile for about 8 months, as I cannot say I have had 5g home internet service for 8 months.  I have a smart home and changing passwords will be a hassle, that I have tried to avoid.  I have powered the device on and off hundreds of times, which usually gets the device to reconnect to the tower.  When that has failed repeated attempts I have resorted to customer service.  I have replaced the gateway 4 times.  I have replaced the SIM card.  I have done multiple factory resets.  Supposedly they have opened 3 tickets to figure out what the problem is.  I have been told contradictory things by their techs.  When I have internet, there are 4 bars and sometimes 5, so there is not any reason for it to drop the signal.  I have had zero bars for the last 2 days, and the device is in the exact same place.  I have moved the device to several locations, yet it cannot find the tower.  There should be some resource when a company fails so miserably in delivering what it promises and accepts payment for services it does not provide.