Anyone fed-up with horrible coverage from TMobile

The poor sevice at my home has been an issue for many years now.  I really have to change carriers.  What is upsetting is that T-mobile customer service promises changes, talks about improvements being made to towers, etc., but nothing changes.  I was on the phone with a customer service rep from HP trying to correct a printer issue and my call was dropped twice in a half hour.  He called back once, but not a second time, leaving us without a solution.  Also, what's upsetting is that T-Mobile was excellent when we first switched from Verizon and went bad.  My theory is that T-Mobile began using AT&T infrastructure at some point.  Years ago when I had AT&T for work it never worked in my home area...now T-Mobile has that dubious distinction.