Return Shipping Label

How in god's name can I get a return shipping label?? I have spent now over 12 hours over 2 weeks speaking with agents who PROMISED AND GUARANTEED that I would get a return shipping label so I can return a fully paid for Xfinity Samsung phone that I found not to my liking. I purchased a different far more expensive fully paid for Xfinity replacement and was told to keep the existing phone in order to transfer the number without risk of losing it when the unsatisfactory phone was returned. Finally achieved success, number protected and transferred to the Galaxy S25 but no return shipping label for the A36. While the return was intiated within the 14 day window, I was told by 4 different Xfinity agents that the return window period would be extended for a few days until the phone number was transferred. Wierdly, that process took days. So I was promised a renewed return shipping label by email. The first one expired. How do I get somebody to actually do something??? I will not eat a $450. absolutely new condition pristine phone because I was given consistent but unfulfilled misleading promises by Xfinity employees.