Profile too low to upgrade

I have been a customer of Vodacom for almost a decade and i have never missed a payment. I am currently paying over 3000 rand a month for my 3 contracts and my fiber line. Two of my contracts are currently due for an upgrade however i have not been able to upgrade because my profile is to low, it is currently at p500 and needs to be higher to upgrade. I am not exactly sure how this is possible as i have never missed a payment nor have I been late on a payment. I went Vodashop twice with no resolution possible i have phoned twice with the phone being put down in my ear once. I don't know what i need to do to be deemed worthy of an upgrade as i receive constant calls from their marketing department saying i have an excellent profile. I am 100% certain that Vodacom will not be able to assist me in any sort of satisfactory manner. So what am i to do? I will have to cancel my contracts and move to another service provider.