Chico is correct with regards to the two best numbers to reach Spyfly Member Support at. 1-800-831-9235 or 1-800-301-5816. However, once you call the friendly member support department to cancel, they will make that very easy for you (they might even offer you a discounted membership option to continue with the service if you're interested) and send you a proof of cancellation email. You do not need to contact your credit card company as this A rated better business bureau company will do whatever you want and make it super easy to do so.

1-800-831-9235 or 1-800-301-5816 are the numbers listed to call, however, you may also want to notify your credit card company and inform them you're cancelling to prevent further charges. Several of these sites make it almost impossible to cancel deliberately so they can continue charging you by not answering your calls, claiming you never cancelled, or not responding to your messages. You basically have to cancel two places, the website and your credit card company so they deny future charges.