Short answer
Pay the open invoice in the client area (Invoices, then Pay Now). The service is switched back on automatically once the payment clears, usually within a few minutes.
Why it happens
Renewals are invoiced before the due date. If the invoice is still unpaid after the due date, the service is suspended until it is paid. Your files are kept while it is suspended.
Still suspended after paying?
Give it 30 minutes, then open a ticket and include the invoice number.
Questions people also ask
Will I lose my files?
Not while the service is suspended. A service that stays unpaid is eventually cancelled, and its files are then deleted, so pay or contact us as soon as you can.