Wanna try a quick speedtest for us on your superior network there, bud? This is taken just now in the middle of a shopping centre in Randburg, so neither a peak spot nor ideal conditions:
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Sounds like you need some more Vodacom experience. Is Vodacom perfect? Heck no. It has issues. But having tried ALL networks over decades, I can assure you that it does most things really well … which is not something any other network in SA can claim to do (MTN has rural coverage, Telkom has cheap prepaid bundles etc etc … Vodacom has a good mix of everything).