unlock Device

My phone was paid off months ago and I have upgraded my devices and I wanted to give my son my daughter old Iphone 11  when we called sprint they told me the phone was lock I literally told them they were wrong because I paid the phone off with my hard earned money and the phone should not be locked because its my phone. well to my surprise I called xfinity to find out it was locked and they had to submit a requested to get it unlocked which is crazy to me however, I said ok un locked it. To be told it will take 24 -48 hours which I really need this phone before my son leave to go back to school. And after reading the reviews on this matter is scary and people are still waiting 20 days later I will go back to tmobile before I allowed this so I need my phone unlock please I have spend 2 days dealing with this matter hours of time to get this solved I mean why cant this be handle as quick as payment are accepted it.

please explain why and I will not wait like some of these other families who been trying to get their paid phones unlock this is horrible and got to be against the law to hinder someone belonging that they paid for. if you pay for a car you expect the keys right same difference, please unlock my phone