SSIS and WinScp not working

I am using WinSCp in an ssis execute process task

My argument is as follows:
/console /command "option batch abort" "option confirm off" "open sftp://username:password@host" "cd /remote folder/remote_subfolder" "option transfer binary" "put C:\Users\myusername\Documents\20151202_153130.csv" "exit"

I use SQLServer 2008 R2, operating system is XP

I get past the authentication and the dos window closes after
Active session: [1] username@host

Please advise on
a)how I can stop the dos window closing too quickly and
b)what is wrong with my argument.

Please respond urgently.
Thank you very much

Please attach a full log file showing the problem (using the latest version of WinSCP).