I know, but i really need them back. 3 years of time and effort I put into getting those coins.
You are in Bitcoins for 3 years already? Didnt you notice that the amount of scammers are huge?
In case you didnt notice yet. You most probably didnt login into your normal blockchain.info wallet but you logged into a fake wallet. So you gave the scammer your wallet login details and he used it to steal your coins.
Even if you contact blockchain.info support it most probably wont work since the scammer will have send the coins to an address only he controls, not blockchain.info.
So im sorry but you fall for a phishing attack and i dont see a way to get the coins back. Unfortunately everyone in here has lost coins to either scams, inept businessmans or or or. Be super cautious, ask others and investigate before you do anything like investing and so on.
And you should enable additional security settings for wallets. 2FA for example. (But dont forget to note down the creationcode for the 2FA. So in case you lose your phone you can setup the same 2FA on another phone again.)