All Transactions that take place on the public Ethereum Blockchain is irreversible

This is the design and nature of Blockchains, once a transaction has been successfully processed it cannot be cancelled or refunded.

If you have sent it to an incorrect address, we are sorry but the only chance of getting those coins back is IF you manage to contact the address owner and he/she is willing to return those coins. However, given the nature of blockchains it is not always easy to determine who owns addresses as they are semi-anonymous. However, if you have sent them to an in-correct CryptoExchange related address, you can try contacting the CryptoExchange owner directly to see if they can assist with recovery of those coins.