Data Depletion (Day vs Night Surfer Changes Not Communiacted)

I am absolutely disgusted at the disrespect showed by Telkom to customers. In February this year I took out a Contract on the Mobile Wifi connection (MI-FI) for R149. The contract comes with 5Gb Day time and 10 All Night data. Understanding this, I always kept my day time surfing to a minimal and Night time I'd use my data to download whatever I wanted to download. I did not have to do anything as the internet connection would switch from day time to night time automatically without me having to do anything, as it was after midnight.

However last month, towards the end of August, I bought 1Gb and it was depleted within a day and when I called Telkom they said it was because I downloaded stuff using daytime data, even then your consultant did not inform me of any changes to the Day/Night time connection. I AM STILL WAITING FOR A RESOLUTION TO THAT CALL.

Again today, I received 5Gb at the beginning of September, only to find I am only left with 1.6Gb today, of which I have not been using my day time data at all. And the night time data is still 9.6Gb, which is strange because I have downloaded stuff this month. I then called your call centre, which is an irritation and annoyance because your consultants are very uninformative and unhelpful. This woman, said I should check if i'm not roaming under MTN. Why should I check that if i have not changed any of my internet settings. All this time I was able to use day time and night time without checking my internet connection or having to switch.

So I asked for the manager, and Berry said that the way daytime and night time data connection works has changed. HOW CAN YOU CHANGE THIS WITHOUT INFORMING YOUR CUSTOMER. YOU DO NOT RESPECT US!!! So Telkom just changed how data works without informing the data users? Where's the logic in that? I'd like details on how to cancel this contract because Telkom has shown how arrogant and careless they are about customer service.