Email Blocked. Please unblock asap

Email Blocked. Please unblock asap

Hi my client hasn't had access to his email for 3 days now. I've upgraded his storage and still says it is blocked. I've tried to unblock it and it doesn't work. can you fix this asap please. 

I've already made contact about this twice to the support email and not had any reply. This is very urgent. Email is nick@riverjet.co.nz