Being charged for Damaged phone that was sent in perfect condition using your Return kit and USPS label

I sent out my return phone in October of 2022, the phone was in perfect condition. Three weeks went by I received a message saying that my phone arrived damaged and was valued at $64 (for Iphone 11 Max Pro), I have to pay the difference of $457. I have contacted multiple reps regarding this issue, the first filed a claim. Now today after still seeing damaged phone amount posted in my account I spoke to a supervisor and he mentioned that there is nothing he can do without tracking #. I told him that they should have the tracking number since they received my phone and that i used their returned label. He basically gave me no other option but to pay the amount. I asked multiple times for picture or proof and he mentioned that he cant sent it via Chat. So I to him to send it to my email. He basically ignore me and my request and went on saying their is nothing we can do. I"m stuck now with a $456 charge with no proof or options in getting the phone back. This totally on call for and I"m degusted by At&t for not taking the proper channels of not investigating this first with the carrier and know very well that no one will write down the tracking # to use this to thier advantage for not reviewing the case. Its not a lost package, it is package they received but claim its damaged.  Such a scam, first phone exchange and not this when i had sprint for many year and have exchanged dozens of phones.