Frustrated by Vodacom or Mondi don’t know who is responsible

Vodacom/Mondi is frustrating me . I cancelled an upgrade with them after a consultant **** to me about the contract costs and gave me a new contract on top of that without my consent. I called to get everything straight and cancel what I did not consent just when I thought everything is sorted , my bill is back to normal, now to my surprise my bill went up and I have a new upgrade of something else of which I know nothing about and I can’t even get through to the call center