did not cancel contract as required

My husband was phoned by an operator telling him about a data bundle for cheaper and he will receive a FREE router. We went to the vodashop to see a list of the contracts. Then he was informed that it is new contracts and not loaded in his number as told. He phoned the same day to cancel and they cancelled it and they came to fetch the router and take it back. We got the vodacom invoice and we are still charged for that contract that was suppose to be cancelled. They are going to deduct the money from his account so I just want to understand how are we going to get the money back because someone didnt do their job. The people are *********** over the phone they keep on transferring you. Please sort this out as I would keep on loading compliants till this is sorted out. They are deducting money I am suppose to use for petrol and food. This must be sorted out very urgently. Not 5 to 7 days later.