Vodacom farce

I have been a Vodacom customer for the past 30 years and tried to do an upgrade online which I am now eligible for. Upon choosing which package I wanted to upgrade to, the system told me I do not qualify for this package. As this is the least expensive package offered (R199 per month) and my credit score is exemplary I was confused as to why. I then phoned the upgrades department and was told the package in question is not available to current customers, only to new customers. I asked them why a loyal customer for the past 30 years would be disadvantaged as opposed to someone who has no affinity with Vodacom. I was then told to hold on and this carried on forever after which I chose to rather hang up. No call back, no interest in me as a customer. Does a company have the right to control your spending habits and limit you to only expensive packages? I ask this as I was also told during the above call that that particular package would be available to me at R309 per month. Of course the answer to this question should be a resounding no. Vodacom however feels otherwise and this needs to be addressed or they will simply lose me as a customer after all this time...