Debited 2 and half years for a product I never received.

I app**** for a product in April 2020. I was approved and was advised that delivery would be within 10 days. However the very next day the delivery was sent to my address, but due to me not being at home the package was returned to the sender..i received an sms confirming the delivery was done. I called them to enquire as I didn't receive the package. Nothing happened but Vodacom debited my account every month. I eventually was able to speak to a consultant who canceled the contract. But the deductions continued. The initial contact was 2 year but I was debited for 2 and a half years for the product I never received. Vodacom stopped responding to my calls. I eventually went to one of their branches on 28 Sept 2023 and I managed to speak to consultant who tried to assist me. She called me back and said the finance department would return a full refund the next day.... But still I have not received the refund.