Warranty is applied for the duration of your purchased subscription. If you purchase 1 Month you'll have warranty for the whole month, same goes for a Year and so on; this means that if your account gets downgraded, we will renew it for free until our private method works.
Note that warranty does not cover any damages/errors/mistakes done by the user and that are not related to the subscription, this includes account's ban caused by your actions, since our method involves fully legal means we're sure that there's no way your account would be banned because of that. We cover your purchase ONLY in the case something happens with your subscription, not with your account / service.