Horrible service from Vodacom customer care

i am utterly dissapointed by the service Vodacom gave me for 5 days straight, with my account showing in arrears when its paid up. i called Subscriber collections for 5 days , there's no answer , when i called customer care today i spoke to a very rude lady called Melissa whom when i asked her to put me through to her supervisor about this issue she told me that she doesnt know who her supervisor is and told me if i dont send proof of payment for the debit order that she can see on the system she cant help me... i no longer want to deal with Vodacom. i want to cancel the contract with Immediate effect.