Will never upgrade again

I went to vodacom to pay my account. like every month. When i enter the shop they said iam not allowed to pay with my card i can only pay cash. But what they don't know i pay my account every month at them with my card. With a argument later. Okay my one contract is due next month to upgage. because if there attitude i will not upgrade i will wait till Feb 2016 and just cancelled my contract and go to a company that want my card and my money