New Inseego Mifi Issue

It seems to be working but connectivity is still crap!  I the day after this to be told by tech support that the device was buggy and that there is some software update coming to fix it by mid-March.  First, I'm upset that I'm being charged full price for a service that is clearly unreliable right now and I can't utilize.  I did call customer service after this.  I'm suppose to receive some type of discount on my bill this month which isn't showing up right now.  Secondly, I'm really frustrated that I was sold a device that is buggy and it was known.  I've been with T-Mobile for about 2 years and have basically been pretty happy till this.