Being charged for mobile router that I don’t own

I have previously reported to Vodacom that I have been charged for two mobile router devices, even though I have received one device. They have contacted me that they will 1. Refund what has been deducted in my account, 2. That they will not deduct in the next month (end of October).

To date, non of the above has been actioned. End of October they still deducted and they have not yet provided me with a refund.