Worst customer service ever

Worst customer service call centre I have ever dealt with. Staff contradict what they say - I was trying to give notice to cancel my contract with them. Firstly get told I can't cancel now as can only give 30 days notice. Next minute they are telling me that I can pre-maturely cancel my contract!!!! The first call centre person wouldn't explain properly what he meant by pre-maturely even though I repeatedly asked him to. When I phoned again later the next person also contradicted what he said - he at least did explain what he meant even though I had to ask him twice. However, I did not appreciate the way he dealt with me nor the fact that he kept on talking over me and when I mentioned a sms that I had received some months previously, he told me I was wrong and didn't understand - I actually did understand and the sms was incorrectly worded and false marketing. I phoned the Vodacom switchboard in JHB as I wanted to speak to someone in senior management to complain about the whole situation. I get told by the lady who answered not to yell at her even though I wasn't - I couldn't hear her properly. And I specifically told her I wanted to speak to a senior manager and not to the customer care centre. She just put me through to Cancellations again. Vodacom is the worse company to deal with and have absolutely no customer service. I would actually like to give them a negative rating.