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Upon checking your account, I see that you're using Paypal as your payment method.
In order to cancel your subscription, you need to do this within your Paypal account by following the steps below:
1. Log into your PayPal account.
2. Find the latest payment you made to us
3. Click on your subscription number
4. Click on "Cancel Subscription" button.
When you cancel your subscription you will not be charged again. But your account will stay in Economy plan until the time you have paid for expires.
I also suggest that you keep your account active for FREE (once your subscription is cancelled your account will be automatically downgraded), so you won't loose your submitted data in case you need it in the future.
Let us know if we can be of further assistance.