If you are unsatisfied with your purchase from Vivoo.io, you may return the product within 30 days and request a refund. The packaging must be intact and the product must not be used. Bear in mind that you will need to cover the return costs yourself.
As for subscription purchases, you should cancel your subscription prior to your anniversary date. This means that your subscription will automatically renew unless canceled at least 24 hours prior to the end of the subscription period. Go to your account settings page at Vivoo to make a change.