Vodacom contract complaint

On December 2019 my contracted had ended for r250 and on January 7th 2020 a sum of r422 was deducted from my account which I was not notified as to why the sum came that much, they had given me some data and airtime which I did not request I foned to cancel my contract and iwas persuaded to keep it going so I asked the guy to keep the bill under 150 because I cannot budget for more he gave me 10gb data not telling me it was once off even after asking him and now I see a bill r250 so I have no ****** clue what I'm signed up for so They wanted to keep me as a customer but cannot adhere to request and no 1can give a str8 answer