u/ChargeActual5097

What exactly am I supposed to do? I have a Samsung S23 Ultra which I have owned since it was brand new 3 years ago. Originally it was on Xfinity Mobile, then Boost for about a year. Yesterday it was blacklisted and Boost claims they can not remove the blacklist, but also can not tell who blacklisted it. I attempted to contact Xfinity Mobile, who simply went in stupid circles saying the device was unlocked years ago