In the unfortunate event that you need to unsubscribe, please log into your account and click on your profile tab "subscription".  Select "unsubscribe" and you will be asked for confirmation. On confirmation you will receive a message which says "... you will not be refunded..".  Ignore this message as you will be prompted to go to your user paypal account and remove the recurring payment option.

In Paypal select the payment you've set up with AAMET and click on "details" and you'll be presented with a screen "Recurring Payment Details".  Click on "cancel" and you will be asked to confirm your action.

Alternatively, another option would be to log on and manually remove the recurring payment by finding the original transaction in paypal.