We offer a free 30-day trial on new accounts. You won't be charged if you cancel within the first 30 days. There is no contract, you can cancel anytime after your free trail, but you will be billed for the month you are using the service.
For example, if your billing cycle is on the 15th of every month, and you cancel on the 17th, you'll still have to pay for the current month, but you won't be charged again after that. In order to treat everyone equally, no exceptions will be made.