Worst customer service ever

I wanted to cancel my contract with Vodacom which was nearing it's end and I couldn't upgrade it anymore due to affordability,so a consultant convinced me by reducing amount I was paying, but not knowing that he is cheating on me by giving me higher gigs but he reduced network speed so that it cannot work for, and again on another contract they forfeited my airtime of which they didn't inform me as it is their policy not to warn unsuspecting customers about this,a rude lady by the name of SIMONE, couldn't help me,she even denied to give me her supervisor, therefore I am warning people not to take contract with Vodacom telephonically,rather go to the store, if you do it online they will rip you off,those consultants are ruthless.