Bad service And Wrong billing

Everytime I call Telkom they refer me to their branch and can’t ever help me because they have captured none existing details that I have never given them.When I get to the branch they log a call to Telkom. When I started the contract I gave them my banking details and they debited their first installment and never continued to debit going forward, I paid their bills via eft ever since but now they are charging me 207.41 for failing to debit from an account I never gave them.