Pathetic Vodacom Service

I upgraded my cell phone in June using the "My Vodacom" App. I DID NOT request a new sim card or a new cell phone number or a new cell phone contract, however, when I received my June invoice I see that there is now a new cell phone number linked to my contract and that I am being billed for 2 contracts. I was told by your help desk that I should have picked up the issue when I received my new phone and new sim card. However, I did not receive a new sim card as I did not request a new sim card, so there was no way for me to have picked up the issue until I received my June invoice. I have phoned your helpline 4 times now and each time I have been promised assistance and that someone will phone me back with a solution. I have yet to receive the promised call back. On Monday I will be going to my bank to put a stop order on all Vodacom transactions - I WILL NOT ALLOW YOU TO ***** MONEY FROM ME! I have also filed a complaint with ICASA. Your service is pathetic.