Metropcs worker scammed me

I went into metric store and traded in my moto razor 2023 and get a new phone. The store employee told me the phone was worth $700 and with the trade in it was $450. Come to find out the phone they sold me was worth only $200… so the metropcs employee scammed me out of $900 with the phone I traded in and the $450 I paid. What can I do about this?

Edit: Called the metro pcs store that the phone was bought, they said they phone wasn’t on promotion so it was $450… called another metro pcs store, worker said phone is $199 maybe $250 after activation fees, he said that metro store scammed the fuck out of me and he’s gonna let his district manager know.