Really sad you didn't use two factor authentication {2FA} so secure your funds. Please going forward don't joke with the usefulness of the power of 2fa. Many people have fallen victim to hacks and the only way to prevent hackers from having access to your funds is by securing it with OTP or 2FA.
2FA is a good security but if you fail to protect it then your account can still be compromise.
On most of my important account, I always have my 2FA and of course there's also a back up to that so make sure you do note of that and keep it on a safer place. We are living in a market that is very vulnerable to hackers and scammers, we should use every security that we can use here in the market and in your online accounts.