What would you do? Bank accidentally deposits N5 million into teenager’s account

A teenager (names withheld) has reportedly become a big spender after receiving the sum of $31,000… after it was deposited by mistake.
And now the bank wants the money back.
Reports say, trouble started when a man with the same name as the 18-year-old attempted to deposit $31,000 at a First Citizens bank branch in Madison County, Georgia. The money was then put into the teenager's account as a result of teller error instead of the depositor.
Ten days later, the depositor made a complaint to the bank over the missing money in his account, with the bank tracing the money back to the teen who had already spent $25,000 .
The teen was contacted by the bank to make refunds, but he refused saying the money was given to him from his grandmother's inheritance.
The account has been frozen since and it's being investigated.