SIGN ONE CONTRACT BUT ARE BILLED FOR TWO

In November 2020 I app**** for a contract. When I received my first statement I was charged for 2 contracts. I contact the relevant people and was I sent proof and was it confirmed that the 1 contract was cancelled. December 2020 I yet again was charged for 2 contracts and I yet again did all the necessary. Today 05 January 2021 I received my invoice from Telkom and AGAIN I am charged for 2 contracts and is my account in arrears in the amount of R2 081,70. There is no assistance at Telkom and if you go into one of their offices/shops there is always no one who can assist. Because of a mistake Telkom has made I can loose my credit ability and be black listed. The other problem now is, is that Telkom tries to deduct the full amount from my back account and I have to pay for the payment rejections. The contract I signed for is paid in full. The other contract does not belong to me and will I not pay any cancellation fees on a mistake that was made by Telkom. Telkom's service is at best non existing. I need assistance and the contract to be removed from my name and account. My account number is *** and the cell number for which I didn't sign a contract for is ***.