Tmobile went back on their word in my case.
I paid off the eip, $630 and have a $0 balance now, taxes were paid at original purchase. So over this.
Apparently my plan is now 'prepaid' and eligible for 200mb free without all the on demand crap.
Now I don't trust tmobile...
Sucks. Sorry.
They honored my deal, but it was not easy and required hours of my time. In the end I think it was probably 50% persistence and 50% blunt, dumb luck.