Pathetic service from "SAs best network "

Not satisfied at all with the level of unprofessionalsim received from vodacom staff called in to downgrade package from 30GB to 20GB for cheaper packaged. Sales agent downgraded my package when i asked it its cheaper then my current package she stated it is when i got my bill i got the shock of my life i was paying R502 for 30GB now im paying R989 for 20GB how does this worrk i contacted vodacom within as soon as i was billed consultant stated that they have placed it back on the 30GB package and i should not stress at the end of thw month i will be billed R50.. Fast forward to end of the month nothing still not rectified i have been calling messaging Twitter no feed back no assistance got a sales agent telling me that why must we disclose the price of a package when you asked for the downgrade... What service is this? I am a loyal client if that even means anything no one from vodacom is willing to assist the inconvenience caused by this is the worst but they dont care as long as they are getting their money they dobt care cheating and decing clients is what they are all about.... SAs best network my left foot that is the biggest bull**** i would like someone to step up and assist