Upgraded incorrectly and charged extra

I was due for upgrade on my data contract for ********** 983 in September. Someone called me to upgrade and the package was to change to a 40gig deal. That person didn't do that and just upgraded as a renewal, I complained about this and was called back twice to say it will be sorted out and nothing. Today is a new month and now I've been charged for the higher package and still have the same contract. R200 more than what I should be paying. Cellc is messing me around as nobody wants to help. Just going from bad to worse.