Telkom Billing me for Non-Existing Account

My Mother went to buy a Telkom mobile sim card for her new tablet but once she finished to RICA it there was no service on the simcard and we could not use it when we phoned customer service they told us that she has an existing Telkom cellphone contract that is in arrears for an amount of R3000 even though she never had a contract with Telkom before. She then made a statement at the police and sent it through to them but even though she did everything she keeps on getting billed for a contract that she Never took up with Telkom mobile which is unacceptable! She has been trying to resolve this enquiry but NO ONE at Telkom does anything to get this sorted out. I need help ASAP.