Bad Service and Poor communication

So I have been with Telkom and Telkom Mobile for years now. One of the reasons I am with Telkom Mobile is because of the fact that unlike other Networks when your data runs out your data gets paused and you are alerted that this happened. What a shock when I found out that this is not the case any more and that they just roll over into your spending limit without informing you. So I called them and they could not explain this to me instead just telling me that I should have known. This is very poor and disappointing by Telkom. The company should have informed their customers that this was going to be the case in the future. I mean I always had a spend limit with them and when my data was depleted I then had the option to either buy more data with my spend limit or not at all. Telkom should rectify this and credit all customers that was not alerted about this at all.