Making it impossible to cancel a contract

I have been trying for hours to try and cancel my contract. I have had people put the phone to my ear, or they just do not answer. When you tell them I lost my monthly income, they tell you to pay the arrears, which I am trying to reduce; they are going around in circles. If I want to cancel, I have to pay in R8k, that is, after paying R2k. Vodacom is crazy, and they just keep on *****ing because if you tell them I can't pay anymore, they just keep on adding expenses. What I don't understand is why, if you are informed that a person needs to cancel due to unforeseen circumstances, you just keep on adding costs. It is sickening how greedy corporations are.