According the FAQ - you just need to send them an email along with your mobile number requesting they close your account.
How do I close my 160by2 account?
We’re sorry to see you go. Please feel
free to let us know your user
experience on 160by2 or any issue due
to which you chose to close your
160by2 account on our feedback page.
You can close your 160by2 account by
sending a mail requesting to close
your 160by2 account along with your
mobile number registered with us to
160by2@smscountry.com.
Best Answer
According the FAQ - you just need to send them an email along with your mobile number requesting they close your account.