Being blocked from upgrading contract

Mid Jan I was notified by Vodacom I was due for upgrade. Tried to upgrade; couldn't cos offline +++ After third visit told I had to pay in R6500 to upgrade because I am no longer eligible for Vodacom special offers on ANY phones cos I had made a late payment. True but with V's okay. Next visit told to contact customer acquisitions. Discover not accessible by public. Then told to contact 082111 and query My Portfolio. Eventually sent to Upgrades and told my account is on the new 3D (?) system - they couldn't explain why this was so or what the new system is. Next person said I would have to wait for six months for customer acquisitions to reassess my status. I demanded to speak to a senior person - this one said he had contacted customer acquisitions before calling me and they would contact me. That was two weeks ago. Nothing. So now I must continue paying for a contract just to maybe have some nebulous person maybe allow me to upgrade sometime. And I keep getting messages to upgrade! Up till recently had 4 contracts with V - now 2. Never missed a payment! Been with V 10 years! So now must I move to MTN? Do something people... and quickly. I want to upgrade NOW or it's goodbye.