I recently connected a BB 8330 alltell phone with metro pcs. They unlocked it for me and it was working just fine for the past 2 weeks unfortunately now it is not working

When i try to make calls it keeps telling me that "your phone is not activated please press end and call customer service" but they dont give me a number to call. I also have the roaming triangle sign on the top of my phone could this have anything to do with it??? please help!!! im so sad!!!
