Vodacom Contract

It's just a shame that i been with Vodacom for so many years and they were my very first Contract that i yook out. But with everything going up i had to cancel. Now when i call December month to ask that i want to cancel they said i can cancel for April. Called today no my contract ends in May month. So every time they move it a month up. One person telling me this and another person telling me that. Now if i want to cancel i have to pay for early cancelation. Why must i pay that one of their people made a mistake. This is really not right