Vodacom Cancellations and service

My contract was ending 19 July,i instructed them through the proper channels on the 2nd of June to cancel after my last payment in July.

I have now completed my contract and i way ahead of time cancelled,HOWEVER i looked at my Aug bill which they promptly sent to me and they STILL havent cancelled this number and i am being billed again.

After multiple calls to cancellations department they instructed me that my cancellation request was cancelled,i asked by who and they cant answer me.

Its early in the month i want this cancelled im not paying for something ive honoured and cancelled way ahead of time.I dont want a credit fix my invoice.

They quick to ask a million questions to verify but cant get a simple instruction like a cancellation right.SHOCKING!!!!

I WANT THIS FIXED!