Bad service

I have a complaint about Vodacom South Africa i left the country nearly 3 years ago to go work aboad. My contract had not expired yet and i could not afford to cancel it. However when the time came i telephonically cancelled them through the agent. The cancellation was successful, however i had not looked into my account for a while and when i had to organise some payments from abroad i realised that after 2 months they had started withdrawing again from my bank account for nearly a year the total coming close to R10000. I contacted the manager of the branch and made my complaint they said they would contact me via email but nothing has occured yet.