BREACH OF CONTRACT AND UNAUTHORIZED DEBIT

I called the contract cancellation department in December to cancel my contract which was coming to an end on the 10 January 2022. The lady who was assisting me with the cancellation offered an unlimited Wifi package which comes with a router. This was delivered before the new year but was only active on the 07 January 2022. Vodacom debited more than the agreed amount which is breach of contract agreed verbally with the lady who offered me the package. The lady stated that i will pay R499. I repeatedly asked her if there are any more charges to which she responded that i will pay R499. I further asked her what will be debited month end of January since this is a new contract, she said she will write everything off and i will pay R499. How does Vodacom debit R723.90? This is in breach of the AGREEMENT. I need to be sent the recording so i can listen to the agreement.