HELP! BILL CHARGE WRONG

I am having a similar issue! Ordered a phone back in Nov 2023 - it never arrived, they shipped a replacement, supposedly, that did not arrive so I cancelled. Went into Apple and purchased with my Apple credit card. Didn't even notice Tmobile has been charging us every month for the lost device for a over a year. I've been calling and spending hours on the phone once a week since. Never get calls back - no one can send confirmations of our conversations...what are our options here?! Currently owed about $450.00 AND COUNTING in wrongful charges on a device I didn't recieve from Tmobile!! Everytime I call, I have to give all the same documentation and information, what is the re-course for things like this, we are only able to post all over Better Business Bureau and their site? Not much good that seems to do - so I have to hire a lawyer to resolve this?