Vodacom unable to rectify payment blunder

I am extremely angry at the service rendered from Vodacom. They offer us use on an app which is meant to make it easier to pay your contract bill however no one can pick up a payment made on the 31st of December. I then sent proof of payment and still no feedback. On further inspection of my bank statements I see that the payment was already deducted via debit order and the app payment aswell which would put me in an advanced payment. These mess ups affect our credit profiles and I intend on escalating this even further. I will not continue doing business with Vodacom due to the nature of service I received.