Mondo: Refusal to provide a copy of the contract

I took out a contract for a mobile Wifi device with Mondo. The contract was concluded telephonically after I received an unsolicited call from a Mondo salesperson. The salesperson indicated that I would receive an email containing the conditions of the contract, or that I could request a copy of the recorded call. Upon calling Mondo a month later to request a recording of the call, they indicated that I would need to go in to a Telkom branch and that a recording of the call will be sent to the branch where I can listen to the recording. I insisted that the contract was concluded with Mondo and that I am entitled to receive a copy of the recording (which constitutes a binding contract) from them. I was advised that it is their policy that they cannot send me a copy of the recorded call and that I have to go into a Telkom branch. Although Telkom is the service provider, I did not conclude a contract with Telkom.