Refusal to Cancel Contracts After Several Attempts

My mom has two contracts with CellC, one a data contract and one a voice contract. The first request to cancel the data contract was submitted in November 2015. Deductions for this contract have continued despite two more requests to terminate in January... A first attempt to \upgrade\" the voice contract to a Postpaid Data Offer Package was made in January with the bundles successfully loaded. However, the long standing debit order of R459.00 for the voice contract went through instead of the new amount of R99.00.<br> "