Invalid invoices, cut off after payment made

I was a Nashua Mobile client. I was transferred to Autopage in December last year. Since them I have just had problems.<br> <br> They do not send out invoices timeously. I only know what is due when they send an sms of demand. I make payment immediately, including email of confirmation of payment. They keep cutting off my personal line even though I am making payment.<br> <br> When I call about this, they tell me they know of problems with the invoices not going out. They also tell me their e-mail is not working. They also acknowledge that they have received payment, but cut me off anyway.<br> <br> On my business line they are also not sending invoices. When I demand them, they are sent and not make out to the correct company. This is an invalid invoice.<br> <br> How can this business even operate with these levels of incompetence.<br> <br> I will be reporting them to SARS for non compliance on the invoices.<br> <br> I will be pursuing how to leave them as a client in terms of the CPA due to this complete lack of service delivery.