MTN business must be the worst

We have an SMS contract for bulk SMS's. I want to change our account from debit order to monthly invoice and want the invoices to be e-mailed to me. And I need an itemized bill.<br> If you e-mail them you get no response - tried a number of e-mail addresses they gave me. <br> If you phone the number they give on their website you get told it is the wrong number you must dial another. If you dial that number, the voice tells you your MTN number is invalid and that's the end.<br> If I can just speak to a live person at MTN who will take responsibility and actually do something.<br> I am about to scream out of sheer frustration!!!