Unresolved matter with Vodacom

Vodacom is refusing to refund me my money after paying them for more than 6 months by accident. I once had a contract with Vodacom and I canceled it last year, after that I used their Absa account by mistake to pay for my funeral policy, at least I thought I was. It was only in July 2020 that I realized that I have been paying the wrong people.After calling and eventually sending emails to vodacom, I gave them all the proofs of the payments made up to July. One of their workers by the name @Ismahil Makgeta emailed me after more than 2 weeks f not responding telling me that they won't refund me and he denied the account claiming that it does not belong. That disturbed me because it is not true. I personally went to ABSA to confirm that the account I used belonged to Vodacom, plus I have used the very same account previously when my account was in arrears hence I had it on my bank app. Pls, @Vodacom, I need my miney back.