Is there any chance of me getting back my Btc from an address which I was not supposed to send or even a chance of getting in contact with the receiver ?
The fact is that if you sent your money to the address where there are active movements then you have a chance to get your money back. If the owner of the wallet turns out to be an honest person and will return it to you. But if you sent bitcoins to the address to which no one has a private key - then that means that you lost them forever.