Telkom Debiting Account Without Permission

For the last 21 months Telkom have been debiting my bank account for roughly R1000 every month, without my permission. I do not have, and have never had an account with them. A third party provided my banking details to pay for their Telkom account. I have had no support or feedback despite numerous attempts to resolve the matter. This is a last resort to have my money refunded before beginning legal proceedings.