phone locked to Assurance wireless, need to activated on Tmobile in order to be unlocked

Can Tmobile help unlock my phone bought from Assurance wireless? My phone is qualified for unlocked, but I no longer has service with them as they told me it would be unlocked automatically which never happened. The phone is Moto G Pure, and it says it's locked to Tmobile. Do I have to buy Tmoible service in order to have it unlocked.