Ridiculous Data Billing

I have an existing SmartInternet-1GB Data Bundle Contract offered by Telkom Mobile since March 2016. The contract came with a Tablet device which excludes calls at a monthly fee of R139.00, the a/c number ********** 53. Since I have taken this contract I have experience various issues of misunderstanding with Telkom and through a lengthy query it is then when it is resolved. However, the issue at hand is that I have received a ridiculous amount of billing for the month of August 2017 to an amount of R2,175.91. I inquired as usual and was provided with a statement which only reflects the amount without an itemised billing (breakdown) . The reference number- ********** 8. I am really frustrated with dealing with Telkom. Through the previous bad experiences I even stopped using their sim card and I am shocked that I have been billed this amount.