Poor Service and follow up after payment was made

Towards the end of last year I was contacted regarding and outstanding Vodacom account of my brother, JL van der Vyver by Hammond Pole. He has been working in Nigeria for two years already and was not aware of the account. As the various people from Hammond Pole could not phone my brother in Nigeria (can't make international calls) I gave them his e-mail address to make contact. They kept on bombarding me regarding his account. To begin with, I wonder where they got hold of my number???? I am only his power of attorney on his bank accounts! He was in South Africa during January and paid the account in full at which time he sent the proof of payment to Ashley Spring that confirmed receipt of the POP and advised that all is settled. Funny enough I kept on receiving calls from various people regarding the same outstanding amount!!!! On Monday I decided to sent an e-mail, as my brother could not get the problem resolved from Nigeria, with the POP. Shirley Foster advised that the ref was wrong, the first digit \I"was missing"