No valuable reason for overbilling by *********** service consultant (call ***)

I cancelled my Contract on the 7th July, the consultant advised me that I would not pay for the contract the 1 August 2020, this sadly was not the case, I called to enquirer and dealt with the most unhelpful customer service agent by the name of Margaret, she did not show any concern to help, had a stinking attitude or provide a valuable reason why they still debited me, How can Vodacom allow employees entrusted to provide service provide there customers with such pathetic and disgusting service.