Vodacom processed a ********** transaction

Last year September I was due for an upgrade on my cellphone contract, however I did not upgrade. Vodacom processed a ********** contract upgrade on my account in September which included a new handset. Since then Vodacom is still deducting money from my accounts, I have faxed and emailed an affidavit , copy of my id and 3 signatures several times. The matter was referred to vodacom ***** department to investigate up to this day they have not given me an update. Its frustrating because they just deducted 2000 on my account today. I will not be held liable for a cellphone that was not delivered to me and was processed without my consent. Vodacom was suppose to protect me as their customer but instead they let me down.