Very Poor customer service, and terrible App

After receiving my monthly invoice on time for a few months, on the correct E-mail address, this month once again, nothing... The MTN App is totally useless, requested my Invoice about 6 times, still nothing... Ended up mailing MTN Customer care for my invoice, gave them all my info including ID Number, address, Banking info & Cell number. Well, I received an Invoice, the only problem is: IT WASN'T MY INVOICE... How can this be so difficult????

Still, no Invoice... This is ridiculous...