Contract cancellation cat and mouse game!!

I recently moved overseas and I have been trying to cancel my cell c contracts for 5 months now with no success. I don't need the data plan anymore. I have been calling cell c contracts customer services and it is either I am told that they cannot access my account and tell how much of a cancellation I should pay [I don't know who then can access my account, virgin mobile maybe?], or the line is just cut when I'm being transferred from one department to another. Money is being withdrawn from my account every month for data I don't even use. And then as soon as this money in my South African bank account runs out, I'm sure they are the ones who will be contacting me.

I just want to cancel my contracts now, really.