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 ?
Why don't you give us more details here before we can help you. Firstly, how did you manage to send to the wrong address as this is very difficult to do? Did you have some sort of malware that changed the address automatically, or did you send to an old exchange wallet or something? Can you post the TXID? Sometimes the owners of wallets/address can be traced through a bit of detective work, but not always.