I need to know WHY my NEW 5G phone STILL isn't good enough for Cricket?

Last year my entire family bought new phones. Last month my daughter had issues with hers so when she put her sim card back in Cricket suspended her account and we were informed that none of our barely a year old phones would work anymore. That Cricket would only use and support 4G and 5G phones. So me and my husband just decided to go ahead and buy new 5G $400 phones. We go to put our sim cards in and we are then told that these new 5G $400 phones are not good enough for the Cricket service so they suspend both of our service and tell us we will have to purchase NEW PHONES FROM THEM to continue to use Cricket.  I kept telling them that these are 5G phones but NO they are good enough….WHY? I can’t afford to pay for another phone. MAYBE if Cricket would allow all the existing customers to use the “New Customer” rates since they are FORCING their customers to upgade. I know many of their customers will not be able to upgrade their phones. Due to their cheaper service many low income families use their service who may not be able to afford these “NEW” phones so I hope they plan to assist these families when the time comes. I am frustrated and sick over this.