As above chemical. I'd already read the announcement. But that says from now until the end of December if you purchase any premium account, then the account will be unblocked.
I have not purchased any premium package and just tried it. And it worked. Dont know why it worked but it did.
So to reiterate I didn't buy any prem package to unblock the account. I just logged to MYKOL and the banned 999 days message had gone, so I tried logging into game and it worked. No payment, no ESN code, nothing.