Lied to about promo They stole my paid off phones

Last August 28, 2023 I signed over to T-Mobile from Verizon because of the "deal" I was promised of prepaid cards for my paid off iPhones (I still have the flyer the reps at the store gave me, that has no expiration date on it). I tried for almost 6 months through T-mobile to get those cards and just recently got an explanation that that promo expired on August 16, 2023 (12 days prior to me turning in my phones) and I only had 3 months to dispute and none of the calls I made to T-Mobile count as a dispute so I am out the prepaid cards and T-Mobile kept my paid off phones THREE of them and will do NOTHING to compensate me! So basically they stole and lied to me! HORRIBLE company. I am currently looking for ANY other carrier that will buy me out of T-Mobile so that I can get away from these unhelpful, dishonest, thieves