Standard Bank ensures that a maximum security is given to all her customer, so removal of Whatsapp from means of sending proof of transaction can not be deam unnecessary. We can always choose other options of contacting our bank with information. Whatsapp being an app that supports instant chat, files transfer such as songs and songs' videos and other types of files including documents doesn't qualify it a means of banking or banking support else, will pave way for fraudsters to beat our financial institute security.
I have seen a lot of great companies ministering to their customers through Whatsapp and these includes Hosting company but then, irrespective of that, our finances need maximum protections. It is of the interest of we South Africans.