Incorrect product

I phoned the Vodacom call centre 2 months ago to manage my data services that I had on my name. I had 3 data contracts due for upgrade. I asked the agent to cancel two of the contracts and upgrade my one 3Gig contract to a 5 Gig contract. He cancelled the two contracts and asked me if I would like to have a WiFi device added to the 5 Gig contract for R20 a month extra. I agreed with these terms and he said an e-mail to this extent will be forwarded to me. In the middle of October my internet would no longer connect, upon investigation we saw the internet cap was finished, which led me to investigate further. This is when I went online and saw that my internet contract was indeed renewed for 2 years but on a 3 Gig contract, which is NOT what I agreed to. Now I had to sit without internet for almost 2 weeks because a call centre agent cannot do his job properly. There is a reason that I opted for a 5 Gig contract as this was the average use when we had the 3 different contracts. I will now be cancelling this contract and go to another service provider, as I have had it with Vodacom on this. Pathetic customer service