Unwanted change on contract & overcharge

Vodacom must be the worse services provider there is, I upgrade my 3G ****le contract with them in about Sept 2017, never had any issues worked fine and what not, due to the fact that i didn't always use it and only for some online games that ****le was (and still is) always plugged in and on charge, the reason for this will be i have a 2GB capped account, how do i know this? because in the past (even after the upgrade) i ran out of data and had to buy more, so I don't care that the device is plugged in and active, nobody is connect to the device at its idle state.

In December I forgot to disconnect my 3G router and we went on holiday, I didn't mind at first but in early January I logged on to Vodacom and found to have a R1900 and something out of data bill. As this was very strange to myself I logged a call with "the call center" (don't even know why you have this as it is useless, you may go check my rating) ref: 1- ********** ********** and to this day i have not yet received a phone call from you. This call was logged on the 5th of January 2018.

I never authorized to anyone to make changes to my account, never asked for my contract be on a open line due to the fact that out of bundle is so expensive.

i just want to let you know that you are pathetic i will be canceling all my contacts with Vodacom, thanks for 14 years of nothing.