Request for contract cancellation and refund

In 2022 February I have app**** for unlimited Wi-Fi router which I’ve returned back to Vodacom within 7 days due to network problem. On that day I’ve managed to cancel the contract but unfortunately Vodacom is still debiting an amount of R720.00 from my account.

I’ve been trying to visit the Vodacom store but I can’t get assistance. I’ve also sent emails to Vodacom customer care but I can’t get assistance.