Vodacom *****, rude *********** and worst service ever.

In 2015 December, i took out a 24 months Vodacom contract which i was paying R100.00 monthly. Contract ended in December 2017. They called me offered 250mb for R30.00 monthly and never mentioned that this is an upgrade. Then March 2018 went to Voda shop to take out a contract, boom to my suprise, i have a 24 months data contract. Stopped paying the account and requested a cancellation which they say it will cost me R800.00 , Jesus R800.00 for a contract which was not even properly explained? Just now this very rude lady called me from Vodacom claiming i owe Vodacom R350.00 , before i can even explain my side of the story she hung up, and a second later i get a text "payment arrangement scheduled successfully" Which arrangement because i did not make any? Vodacom service is bad very bad, the consultants *********** *****. I want to cancel this contract without paying any amount because it's not my fault that your consultants are decieving your clients.