How can I get my ether back from coinbase?

I used to have an account in Coinbase, and it was closed in 2018, but recently 2020, I mistakely withdraw some ETH to the deposit address in the closed account.

It's about 100 eth, I try to login Coinbase again, but it seems coinbase give me an new account with the same e-mail before, but with a new ETH deposit address.

I tried contact coinbase support, they reply too slow and didnt carefully check my situation, just tell me that ETH address didn't belong to my current account.

I have a lot of old emails from coinbase (withdraw, deposit) of my old account.

How could I get that ETH back?