Desperate with Eskom East London

Acc *** We cannot seem to get in contact with them on email or telephone. NO reply to either. We also tried to go online to get our account. It wants the last invoice issued, which we don't have. We for months have tried to get this account emailed, but no luck with that either. We have to pay or get cut off. So what now? Who is able to assist us? More than desperate.