The MTN-run-around-for-service experience

I hope MTN responds to this review, since they don't seem to respond in any other way. For the last 2 months retrieving a tax invoice for my 2 MTN numbers is impossible. They used to send an email with an login link which you logged into and retrieved your latest tax invoice complete. easy. Now, that does not work anymore. You are sent an email with a link that takes you to site where you are to search for documents ( and they don't exist and/or can't be found.) I have not received a complete & correct tax invoice for 2 months , but they Bill me on time, every time. They have multiple little apps & portals to give you the run around, but a simple thing like sending correct & complete Tax invoices to clients seem to be beyond MTN's capabilities.