As of now the account cannot be canceled or removed. However, you can cancel the subscription of the proxies package. Once the proxies expire, the proxies will be removed from the account and the account gets deactivated.
If you paid via Fastspring, please contact us via chat or send an email to firstname.lastname@example.org cancel the subscription.
And if you paid via Paypal and do not want to continue with the service, kindly deactivate the auto subscription on your Paypal account.