Telkom - Bad Service and unexplained Data loss

Very disappointed in the service of Telkom. Called in regarding an app download that keeps on running. When the download in the app store finishes it starts from the beginning to download again and it takes the same megabytes as the initial download of +/- 75mb. From 29/04/2018 - 30/04/2018 I lost 450mb because of this. The only response I got from the Telkom helpline is that they won't be able to assist. Where is my 450mb as the app never installed on my device.