Unauthorised debit order

Dear Vodacom, Last month I called to request that you please don't debit my account like you normally do - i'll make the payment on the 17th March. The agent i spoke to made all the necessary arrangements and confirmed that I can make payment direct into Vodacom account. On the 29th Feb i made a direct payment of R2478.53 into your Vodacom simply because I now had the money to pay Vodacom. Which means i paid 19 days before the arranged date. I called your call center on the 29th Feb around 10am to confirm that i have made payment (payment that i had arranged to make on the 17th March 2020) i made it on the 29th Feb 2020, she confirmed with me that she can see the payment from FNB and that no debit order will be going off my FNB account. GUESS WHAT?? this morning 18th March an amount of R2478,53 has gone off my FNB account Ref Vodacom ***Q- WHY??????? when i have already made it a point that my vodacom account is up to date. Are your systems not sync or centralized??. I need my money back I need to buy food for my kids they are home and they need food. I always make sure that my payments are sorted so that i don't get inconvenienced. Now i have to be inconvenienced cos of your incompetence??? sort your mess out - I want my money back, don't tell me to wait for 3 days - my kids won't can't wait for 3 days without food. I am so glad i am not renewing my contract with you in August - you just keeping messing up over and over again. You are the gift that keeps on giving!