Bad service from Chartered Secretaries Southern Africa

I have been trying to contact the Chartered Secretaries Southern Africa for over a week now, you write emails they dont respond to you, when you call the landline no answers the phone even when you live message for someone to call you back there is no answer. I have been give over 4 emails to write to no one responds to any of the email for assistant. And all I wanted was to register and get invoice for payment.