Just tired of dealing with Vodacom in general

I have been a customer of Vodacom for more than 10 years. I went to Vodashop in Cape Gate today to upgrade my contract. I was told by the consultant that apparently my credit score is too low,so I am not allowed to upgrade. They will however come back to me in this regard and I may have to pay extra or have the option of carrying on with my current contract. I was a bit dumbstruck and when I got back to the office I took the time to check my credit profile with Transunion and Clearscore,absolutely nothing wrong there. I then tried to do an upgrade online, I was told that I do qualify for an upgrade but not the one that I chose for R699 per month. I do however qualify for the Red packages which are R819 and higher. So in other words,my credit is not good enough to qualify for a cheaper contract,but I do however qualify for the more expensive contracts. Not really sure how this works...please help me understand Vodacom?