Hiveos Locked

I have been mining on hive os for months, initially with 1 rig and now with 2.
Since always the balance shows a negative balance of a few cents / dollars. It seems to me that Hiveos is free, unless you have a lot of machines. This is not my case. But today i can’t get access to myè rigs because my Hivos il locked. Could you tell me how to unblock my account please?

I just sent a mail to support