Don't trust MTN that does not honour their own commitments

On 18 July, I lodged an complaint about a double payment debitorder withdrawal on an MTN contract. On 20 July, I was informed that a billing dispute was lodged and that it would be resolved in 2-24 hours. Needless to say, I have not received any feedback, 10 days after the dispute was lodged. Don't trust a service provider that does not even honour their own commitments.