First of all, you should try to contact Binance support. Secondly, let's find out why it happened. Have you ever left your contact open? Does anybody else have an access to your device?
Aside from contacting their binance support via their site, try sending pm also their binance telegram account -
https://t.me/binanceexchange. Try contacting all possible contacts of binance as soon as possible so they can still block the withdrawal from your account. Because if you will change the 2FA, it needs I think about 7 days to approve the change.