I have made a mistake by sending cash bitcoin from Blockchain to Coinbase bitcoin address ( instead of Coinbase cash bitcoin address)..

i want to retrieve the fund or send it back to my blockchain so i can input the correct address again ? anyone knows how ? please make it as simple as possible because i do not have a lot of knowledge about bitcoin since i am very new to this world..

I have emailed both Coinbase and Blockchain about this matter, it has been two days and no answer..

thanks for your time and help in advance...