@greg1983 I doubt tower upgrade caused the prolem, as long as T-Mobile still have LTE/4G there
Data and text are on LTE/4G so it should not relatively easy to connect, voice is a different story
But, don't get too upset, if you are back in Canada now, open ticket with PM and they usually will reverse the transaction without much push back
If you are still in US, enjoy your time there, buy a local data sim card and use it there instead of trying to roam