Telkom *****ing Data

I do have a LTE contract with Telkom. Every month I get 20 GB mobile data for all hours use, valid for 1 month, 10 GB night time data for night use, valid for 1 month and 10 GB Smart broadband data for all hours valid for 2 months. I often run out of data and then buy Once-off Anytime data valid for 2 months. By the end of July I was working on the Once-off data which expire on 20 August. What happen is that Telkom automatically start using the new month's mobile data on 1 Aug in this case expiring on 1 Sept, then they use the Smart broadband data expiring on 1 Oct before they start using the paid for Once-off data expiring on 20 Aug. This mean that you loose all the prepaid data you have still left from the previous 2 months. In my eyes nothing less than *****ing from a client. I tried to send them an e-mail which seem to be impossible and are seriously thinking of going to another service provider as their coverage in remote areas is pathetic but that's another story.