You've tried to unlock this device too many times. Wait 30 days and then submit a new request.

When I try to unlock my device, it said" You've tried to unlock this device too many times. Wait 30 days and then submit a new request." So I waited for one month and tried again, but it still said that. And I waited another month and tried again, but it still said so. I've waited for three months and tried three times!!!!! I want to know exactly how can I unlock my device? Please solve my problem as soon as possible!!!!!!