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 ?
Unfortunately you made a mistake that is very detrimental to your own, I think you will not get back BTC you send to the address you do not want.
The way out is you have to find the bitcoin user address and talk well to get your BTC back (but it is very unlikely your BTC is returned).
To find out the user's address is already very not easy. then, you must apply the conversation and seduce.
I suggest you forget it, then Move on.