MTN sucks worse than ever

I have been trying for some time to get my June invoice from MTN, a document they are legally obliged to provide. The last invoices on their customer portals are from May, and the "8 business hours" turnaround time on emails is almost as big a joke as their Facebook team. Apparently in exchange for this legal document, I am required to provide enough information to clone my ID in an insecure email, which is not happening. I'm astonished that they even ask! I have sent several emails and messages, and requested to be contacted on one of two provided numbers (NOT the number associated with the account), but the general attitude is one of complete indifference.