T-Mobile home internet signal booster? Any tricks?

I also have the T-Mobile Gateway and I only get 3 bars.  This pass two weeks we in my area lost complete  use of this system.  A T-Mobile store, right across the street from  me put a sing on their door stating "we don't know what or why we have no service ".  This was not resolved with ant kind of explanation from the company.  In fact T-Mobile has not even addressed the issue in anyway.  But charge you for the service in full.  You can't even get them on the phone.  The overseas people tell you they do see any problems.  Of course I think I may have make a mistake by getting involved with T-Mobile, what about Version?