Vodacom

I have been with Vodacom for many years, I had to run around the last 3 weeks, Needed to upgrade, they wanted to charge me almost 600 rand more, tried calling speaking to stores and the head office, the opposition had a deal much better, but I had to cancel my contract (it expired last month) I called from the store: lady on the phone told me a lot of stories, and that I would have to pay them for April, then she could not hear me for some reason this cancelled my new contract as deals run monthly, Vodacom then offered me a 3 years contract I was not happy about that, i was promised to be called back by 4 pm today, never happened, please make sure that you know, You need to give 30 days notice to Vodacom even if your contract did expire, I THINK This is wrong