Xfinity reject to unlock my iPhone

I am a customer for xfinity for years and i get my phone with them every couple of years. I travel to italy multiple times every year. I called to unlock my iPhone so i can use it there during my trip but they said no. They said the phone must be paid in full in order to unlock. They kep saying this is the policy. I don’t care what is the policy I care about my needs. What is the point of not allowing me to use my phone overseas. Was not happy at all and will switch to another carrier once my contract is over