Unauthorised Debit order and Account

I received an invoice for R1074.64 for an unknown account , for the period 23 Oct 2018 - 30 Nov 2018. The amount was also deducted from my account via unauthorised debit order. I contacted customer care 10210, and the consultant confirmed the account was linked to my name but he cannot see any service, mobile or circuit number linked to the account. A dispute was logged, but now my Telkom Mobile account is being disconnected due to non payment of this ********** Telkom transaction.