porting to a Different Network

I have been a vodacom customer since 2004 but now i had enough,i took a phone on contract for 24months that lapsed on the 31 Dec 2015,prior to the last days of my contract i phoned the customer service/cancellation Dept to load the cancellation on my line however they failed to do so and when i phoned in the lady that i spoke to was giving me bad attitude instead of been helpful like a service provider she even put me through to service rating while i was speaking to her.....i phoned in again and i spoke to a Team leader by the name of Palesa and she checked my account that i opened with vodacom and it reflects that i phoned in for cancellation however the cancellation Dept failed to do the cancellation and worse i didn't get any notification that they missed my cancellation or whosoever,now I'm gonna be charged for what i did not ask and i can't make any calls till this has been resolved as i'll be billed which is totally *******,i'm beyond disappointed and now i want to partways with vodacom and this gives me the assumption they dont want me go however keep billing me.