I just tried to cancel my Torguard service (long story) and on the cancel page it showed:
Requesting Cancellation for: Anonymous Proxy - Anonymous Proxy
Finding it hard to pay your bill?
We understand, these things happen in life - we have generated a personal code to give a 55% recurring discount just for you, you can apply it to all current invoices - XXXXXXXX- we hope this will make things a little easier for you, especially at this time of the year
On the Home page, click on the "Management Actions" button next to the service you have and select "Request Cancellation". On the next page it provides the code even before you hit "Request Cancellation" button, so you don't actually have to cancel your service.
The code provided seems to work for any new services you get. Just add the code to on the cart/checkout page.