Cancel Vodacom contract

I have emigrated to Portugal and am trying to close my Vodacom account. My contract expires at the end of March. While still in South Africa I wanted to give notice to cancel my account when it expired in March. I was told that I could only give notice 1 month before my account expires and I was not able to give 4 months notice for my account to be cancelled once it expired. Now in Portugal you cannot cancel your account on the web and have to either go to a branch or phone the call centre. I have been with Vodacom for years and must say I have never had such terrible service from any provider, neither have I seen such arcaic processes. Vodacom do you know what century this is?