billing for numbers exported to cell c

In August 2015 I exported two contracts to CellC. The contracts were paid in full and one data contract remained with Vodacom. On my February bill from Vodacom I get billed for the two cancelled contracts.<br> In January 2016 I visited Vodaworld to sort out the contracts but it seems now they have not sorted out the problem .<br> I also requested the debit order to be cancelled but that also didn't happen.<br> Trying to fix this by phone seem to be impossible.<br> Account I***-3<br> Number with Vodacom ***<br> WHAT DO YOU NEED TO DO TO GET RID OF VODACOM??????<br>