Bad customer service

All I want is an invoice.

Unfortunately Vodacom discontinued their app, so that is no longer an option. Their website don't allow me to link my number because "it already linked to another user" (old discontinued app). I cannot install the new Vodacom Pay app because the number "is already linked to another user".

Now Vodacom can expect a complaint from me on Hellopeter every month until they get their systems sorted out.