Telkom took a new contract on my name and charging me for it without my permission. Not helping to cancel it and refund me

I app**** for a contract renewal, Telkom did the upgrade and without my permission a 2nd new contract application. I immediately let them know, the extra (new contract) was collected by their courier on the 5th of may. I've now been billed for a new phone which I DID NOT order. It's not over a month and they are not refunding me or cancelling the contract.