Vodacom Sucks Bad Customer Service on Upgrade

I finally decided to upgrade and chose to do so via the call center by dialing *** and spoke to A gentleman by the name of Sibosiso in the upgrades department. I mentioned that i would like to upgrade to the special they have on the Samsung S4 Mini for R179 per month. After checking my profile he mentions that i do not qualify for this deal due to my profile i can get the same phone but for R199 per month. I then asked him to explain what criteria are used to determine my profile which he was not able to answer merely saying it is based on my ITC conduct. I fail to understand why my ITC conduct prevents me from taking a deal for R179 per month but allows me to do so for a deal for R199 per month which is clearly much higher. This from my point of view is clearly a sales strategy to prevent customers from taking up the cheaper option, seeing that he was not able to clearly explain to me why i cannot take up the cheaper option. In general Vodacom sucks and i will be cancelling my contract and migrating to a provider that actually understands customer service.