I want to cancel my contract

I called in the call centre and spoke to a lady who told me that if I cancel my phone contract today, my last debit will be on the 01 April since I need to give 30 days notice period. I am fine with that. The problem is that the lady transffered me to retensions and I spoke to a male consultant who then told me that my contract ends in May or June. I do not understand this because according to my knowledge, I took the contract in March 2014 and the first consultant I spoke to confirmed that If I cancel, the last debit will be on the 1 April but the other consultant is telling me a differentstory. I am not happy about this as it seems as Vodacom is forcing me to keep this contract. I want to cancel my contract please and since your consultants are not helpful, what should I do?