Upgrade not reversed as promised

Went there looking for a new line on the 8th july at vodashop greenacres the bridge. I was told no I don't qualify for it which I didn't have a problem . But I was told I do qualify for upgrade. The lady by name of Zoleka fid the upgrade . On the 9th I wrote an email to vodacom customer service not to process the upgrade . I even made a call to head office then I was told that it's not processed and I must also go to the vodashop to cancel or reverse it as it was supposed to start on the 1st of August . I went to the vodashop on the 14th at the brige greenacres to cancel or reverse it and remain on the old product . The white slender lady helped me and said she has done it. But today the 1st August the new upgrade has taken place as I checked nothing reversed or cancelled . Please help me on cancelling this or reverse it I don't need it anymore and remain on the old product with vodacom which will end in 30th December