Bad service and lack of professionalism

i continue to get grief from Vodacom with regards to the contract which was wrongly captured by their consultant. i received a call today from Vodacom informing me that they will not effect a discount on my contract despite the fault being on their side. just to recap, in November 2018 i got a call from Vodacom or one of their representatives offering a me a 30gb day and 30gb night data deal for R345.

upon receiving my first invoice, i realised that i was charged more than a thousand and when i made an enquiry i was told that i was on an open line package which i never signed up or agreed to as my deal was a top up.

the guy then said he would rectify it and put it on a top up so that i can pay the correct amount. never once did he mention that i would be paying more than the deal amount was for this migration.

i have been asking Vodacom to rectify this and today i received a call being told that this matter will not be rectified and the only thing they can do is give me a once off discount. why should i continue being penalised and paying for their error.

i was very specific in terms of what i wanted yet they went and did their own thing which i am now paying for. i have also asked them to listen to the tapes from November and then again in Feb when i requested the matter to be corrected and this doesn't seem to have been.

for me to cancel the contract i get to be penalised yet again which is totally unacceptable