Telkom, please help

My fiancé and I recently upgraded our Telkom line from a 4mbps adsl uncapped line to a 10mbps lte line.

At first everything was great and we were very happy with the move but then all of a sudden we were throttled down to 4mbps and for the last 2 days the line has been throttled further to 2mbps.

Upon calling the telkom call centre we were advised that the line would only be 10mbps for the first 50gb, then it would drop to 4mbps and then after another 50gb it would drop down to 2mbps.

Firstly, why were we not told this when we went through the process of upgrading the line which we did in store with a consultant?

Secondly, we are paying a premium of R900 per month for this service and that only allows us 50gb at the advertised line speed? That is shocking! Feels like we have been absolutely **********.

Now normally I would be a bit upset about this, but with the Covid 19 pandemic taking place I am furious and horrified as we are relying on this internet connection to be able to work from home. Today I had to connect my laptop to my cellphone in order to be able to work which I simply cannot afford on top of the R900 telkom subscription. I will not be able to do this for the rest of the month which means I will need to risk infection of a deadly disease to go back to work at the office.

Telkom please, this is not acceptable, I urge you to please rectify this urgently, please.