Hi @samiulsaadi1,

Poloniex is a well known exchange, and they are not responsible of any transaction made by your account to their platform.

Nobody can make a transaction using your account. So from what I understand:

• someone made a transfer from your account to the poloniex platform.

First I don't understand why you are insulting us but let put that aside and consider that you were angry because of what happened. You should say at least that you are sorry.

Second your account probably got hacked:

• the only possible reason is that you gave your keys to someone else, either by directly giving your keys or by using a phishing link that stole your keys.

Do you remember any website where you have entered your steem keys? If so please let us know then we can try to make a post about it to prevent further hacks.

So nor us nor poloniex are responsible for this.
What we can suggest you is first to change the keys of your account. Second try to contact poloniex using their support : https://support.poloniex.com/hc/en-us and explain them calmly what happened, they might help you to find who did it and maybe block the account who stole your funds.

Finaly be careful when you are using your keys on any other platform that doesnt use steemlogin or keychain. (Except steemit.com of course). And of course you should change your keys right now!
Best regards,