Disappointed at Vodacom Fibre department

On the 1st June 2023, I sent an email to Vodacom Fibre terminating my service with them. Everything went well as they kept me informed with the process until the matter was concluded on the 5th June 2023. I received an email telling me that fibre will be canceled on 1July 2023 at midnight. To my surprise, on the 3rd July, when i checked my statement, I realized that my account had been debited by Vodacom even after I canceled this. I am aware that these types of services are paid in advance, so my May payment was supposed to be the last payment. I have been sending them emails to enquire what happened instead of just going to my bank to block and reverse the R699 that was taken from my account , but I am not getting any joy except for what in my mind are "automated response". This is really an inconvenience as i have installed another affordable fibre since Vodacom's one was becoming extremely expensive and had to now pay 2 providers because of Vodacom's mistakes, inconvenience, and incompetence.