Vodacom has the worst service ever!

I have been trying for 8 months to cancel a contract that I do not use. Someone hacked my details and have been using it for months and I am debited every month. I went to Vodacom in February and a gentleman promised me the account will be closed. nothing happened and to date they payment still gets deducted. I called Vodacom on Friday and the lady promised me it will be closed. I do have a ref number for the call. She told me to write a letter to the ***** department, which I did and mailed off, and to date I have had no response. I called yesterday to follow up, just to hear that the account is not closed. I was put through to every department who I told my story, just to then hear they are off line. I went back to the Vodacom store yesterday to cancel the account again. I have been a loyal customer of Vodacom since 1994, and have now had it. I have lost R9000 since Feb due to this account.