Vodacom cancellation department not honest

On the 22 January 2018 I contacted Vodacom spoke to Siyabonga he advise that my serive will be cancelled. On the first I still received my air time I contacted vodacom and spoke to Nhlanhl who advise me that my contract is still not cancelled he than said he will cancel it he took the airtime back however when I check my amount due its still the same installment although i gave notification